Baby Milestones

When Do Toddlers Play Together? Parten's Play Stages Explained
You set up the perfect playdate — snacks ready, toys scattered across the floor, two toddlers face to face on the play mat. And then... they completely ignore each other. One stacks blocks while the other pushes a truck in circles. No sharing, no conversation, no interaction whatsoever. Before you chalk it up as a failed social experiment, here's what developmental scientists want you to know: this is exactly how children are supposed to play at this age. In 1932, sociologist Mildred Parten identified six distinct stages of play that... Read more...
When Do Toddlers Make Friends?
My son was two and a half when he came home from daycare and said a name I'd never heard before: "Oli." That evening he asked for Oli at dinner. The next morning he asked if Oli would be there. Within a week, he was saving the red truck for Oli and melting down if anyone else touched it. I was witnessing something remarkable — my toddler had chosen a person. Not because Oli was assigned to his table or happened to be nearby, but because something about Oli clicked.... Read more...
When Do Babies Wave Bye-Bye? Your Guide to This Social Milestone
You're standing at the front door saying goodbye to a visiting grandparent, and your nine-month-old suddenly lifts a chubby hand and opens and closes their fingers in a wobbly wave. The room erupts. It seems like a simple party trick, but that first wave is actually a sophisticated act of social cognition — your baby has observed a gesture, understood its social meaning, and reproduced it with their own body at the appropriate moment. Developmental researchers rank waving among the earliest true social gestures because it requires imitation, bilateral hand... Read more...
When Do Babies Understand "No"?
Your eight-month-old reaches for the dog's water bowl for the fifteenth time today. You say "no" firmly, and she pauses — then grins and reaches again. Is she ignoring you? Testing you? Or does she genuinely not understand the word yet? The answer is more nuanced than most parenting books suggest. Babies process tone, facial expression, and context long before they decode the actual meaning of words, and that gap between reacting to "no" and understanding "no" is where a lot of parental frustration lives. Here's what the research tells... Read more...
When Does Separation Anxiety Start in Babies?
The first time my daughter screamed when I handed her to grandma — someone she'd smiled at dozens of times — I genuinely wondered what had gone wrong. Had something scared her? Was she sick? It took a frantic Google search to realize this was not only normal, it was actually a sign of healthy brain development. Separation anxiety feels alarming when it first appears, but developmental psychologists consider it one of the most important emotional milestones of infancy. Understanding the science behind it can turn a stressful phase into... Read more...
When Do Toddlers Start Talking?
Somewhere around her first birthday, your daughter looked right at the dog and said something that sounded suspiciously like "goggy." You replayed it in your head for hours. Was that a word? Does it count? The line between babbling and talking is blurrier than anyone prepares you for — and the range of "normal" is so wide that comparing your child to the toddler next door is practically useless. Some kids are stringing two-word phrases together at 14 months; others barely say "mama" with intention until 20 months and then... Read more...
When Do Toddlers Learn to Share?
Picture this: two toddlers at a playdate, one truck between them, and a parent hovering overhead saying, "We share in this family." Thirty seconds later, someone is screaming. The truck has been yanked away, feelings are hurt on all sides, and the parent wonders where they went wrong. Here is the uncomfortable truth that most parenting advice skips over — developmentally, toddlers under three are not wired to share. It is not a character flaw. It is not bad parenting. It is neuroscience. Understanding what is actually happening in your... Read more...
Baby Week 31 Development: What to Expect
Speed changes everything. Your 31 week old baby has likely moved past the hesitant, wobbly crawling of a few weeks ago and is now motoring across the room with real purpose. Some babies at this age are already pulling up on furniture and taking those first sideways steps known as cruising. Tiny fingers are getting more precise too -- you may notice your baby using a thumb and forefinger to pick up a single Cheerio or a piece of lint you wish they hadn't found. And then there is the... Read more...
Baby Week 29 Development: What to Expect
Something shifts around week 29. Your baby is no longer content to sit and observe -- they have places to go. Your 29 week old baby is likely creeping across the floor with deliberate purpose, reaching for specific objects rather than just whatever happens to be closest. The pincer grasp is beginning to emerge, peek-a-boo has become a genuine obsession, and you may have noticed that the word "no" actually registers now, even if it does not always produce the reaction you are hoping for. This week is about intention.... Read more...
Baby Week 28 Development: What to Expect
Seven months. Your 28 week old baby has crossed into the second half of their first year, and the changes coming this week feel less like incremental progress and more like a preview of the toddler who is on the way. This is the week many babies figure out how to push themselves up into a sitting position from lying down -- a skill that sounds simple but requires remarkable core coordination. You may also catch your baby rocking back and forth on their hands and knees, which looks like... Read more...
Baby Week 27 Development: What to Expect
Something shifts around week 27 that catches many parents off guard. Your 27 week old baby, now roughly 6.5 months old, is no longer content to sit and watch the world -- they want to get to it. This is the week when many babies begin pulling themselves forward in a commando-style army crawl, belly flat against the floor, arms doing all the work. Independent sitting is becoming second nature, freeing up both hands for a new favorite pastime: banging objects together just to see what happens. And the babbling?... Read more...
Baby Week 26 Development: What to Expect
Half a year. It sounds like such a small number, yet everything about your baby has transformed since those earliest newborn days. Your 26 week old baby is likely sitting up with growing confidence, may be plotting their first army crawl across the floor, and is beginning to understand that when a toy disappears behind your back, it still exists. This week marks a genuine turning point -- your baby is no longer a passive observer of the world but an active participant who reaches, grabs, rolls, babbles, and very... Read more...
Baby Week 19 Development: What to Expect
There's a sound coming from the nursery that's somewhere between a motorboat and a laugh — your 19 week old baby has discovered raspberries. That wet, buzzy lip vibration might seem silly, but it represents serious oral motor development. Week 19 is when many babies start surprising their parents with new physical feats too. Some roll confidently in both directions now. Objects move from one hand to the other. And the baby who stayed put on a blanket two weeks ago is suddenly scooting, twisting, and ending up three feet... Read more...
Baby Week 18 Development: What to Expect
Place a colorful toy just out of reach and watch what happens. Your 18 week old baby doesn't just look at it anymore — they reach for it, often with both hands at once, fingers spread wide and arms straining forward. This bilateral reaching is one of the defining skills of week 18. At roughly four and a half months, your baby's upper body strength is surging. Tummy time pushups are getting higher, social smiles are turning into full-body excitement wiggles, and you may notice the first signs of teething... Read more...
Baby Week 17 Development: What to Expect
You will know your 17 week old baby has entered a new phase the moment everything they grab goes straight into their mouth. The rattle, the burp cloth, your finger, the edge of their onesie — nothing is safe from the oral investigation unit that is your four-month-old. This is not random behavior or even necessarily teething (though it could be). Mouthing is one of the most important sensory learning strategies your baby has, and at week 17 it kicks into high gear alongside a handful of other developments that... Read more...
Baby Week 16 Development: What to Expect
Week 16 often feels like your baby has crossed an invisible threshold overnight. One morning you set your 16 week old baby down for tummy time and they simply flip over onto their back — no fanfare, no warning, just a sudden roll that leaves you both wide-eyed. This is one of the hallmark weeks in infant development, a moment when multiple skills that have been quietly building finally converge. Your baby's core muscles are strong enough to power a full roll, their hand-eye coordination has sharpened so they can... Read more...
When Do Babies Stack Blocks? A Guide to This Fine Motor Milestone
There is a moment of absolute focus that happens when a toddler carefully places one block on top of another, holds their breath, and then — it stays. The triumph on their face is unmistakable. And then there is the equally joyful moment two seconds later when they knock the whole thing down. Block stacking, which typically begins between 12 and 18 months, is one of the most telling fine motor milestones in early childhood. It looks like simple play, but each successful stack requires voluntary release control, spatial reasoning,... Read more...
When Do Babies Show Affection?
The first time my son pressed his open mouth against my cheek — more drool than kiss, honestly — I melted. He was about seven months old, and up until that point, affection had been a one-way street: I kissed him, held him, whispered how much I loved him, and he... stared at me. Or spit up on my shoulder. That sloppy, unprompted "kiss" was the first time he gave something back, and it changed everything about how I understood our bond. Babies develop the ability to express affection gradually,... Read more...
When Do Babies Recognize Faces?
Within minutes of birth, your newborn is already searching for you. Not your voice — your face. Decades of research in developmental neuroscience have revealed something extraordinary: the human brain arrives pre-wired to detect and prefer face-like patterns over any other visual stimulus. That blurry little gaze locked onto yours during those first skin-to-skin moments isn't random. It's one of the most sophisticated pattern-recognition systems in nature, booting up in real time. As a parent who remembers the first time my daughter seemed to truly see me — around six... Read more...
When Do Babies Point? A Guide to This Key Communication Milestone
A tiny index finger stretches out toward the family dog across the room, and the whole dynamic between parent and child shifts in an instant. That first deliberate point — usually somewhere between 9 and 14 months — is far more than a cute gesture. Pediatricians and developmental researchers consider pointing one of the most important communication milestones in a baby's first year. It signals that your child understands something profound: that they can direct your attention to something they find interesting, and that you'll look. The American Academy of... Read more...
When Do Babies Play Peekaboo?
The blanket goes up. The blanket comes down. Your baby shrieks with delight — and immediately demands you do it again. And again. And again, until your arms ache and you start wondering: why is this so fascinating? The answer lies in one of the most important cognitive breakthroughs of the first year. Peekaboo isn't just a game — it's your baby's first experiment in understanding that the world continues to exist even when they can't see it. That realization, called object permanence, reshapes how your baby thinks, bonds, and... Read more...
Baby Week 49 Development: What to Expect
Somewhere between breakfast and lunch, your 49 week old baby figured out how to open the cabinet under the sink. Yesterday they could barely toddle three steps without sitting down; today they are marching toward everything that was previously out of reach, pulling open drawers, and investigating the world with the single-minded determination of a tiny scientist. At nearly 12 months old, your baby is not just walking -- they are exploring with purpose, building a vocabulary that surprises you daily, and beginning to understand instructions that involve more than... Read more...
Baby Week 46 Development: What to Expect
There is a moment that stops every parent mid-breath: your baby lets go of the coffee table, stands there wobbling for a heartbeat, and then takes two shaky steps forward before sitting down hard on their bottom. Your 46 week old baby is on the edge of walking, and everything about this week feels like a countdown to something enormous. But those tentative steps are only part of the story. At 46 weeks, your baby is also stacking blocks with growing precision, saying a handful of real words, and beginning... Read more...
Baby Week 33 Development: What to Expect
Your 33 week old baby is no longer content to sit and watch the world go by. This is the week many parents look up from their coffee to find their baby standing at the sofa, shuffling sideways with both hands gripping the cushions, grinning like they just conquered a mountain. Cruising -- that glorious, wobbly sidestepping along furniture -- has arrived, and with it comes a whole new perspective on the world (and a whole new set of things to baby-proof). At the same time, your baby is learning... Read more...
Baby Week 14 Development: What to Expect
At 14 weeks old, your baby is crossing into exciting territory. Those early newborn days of constant sleeping and feeding are giving way to a more alert, interactive little person who genuinely wants to engage with the world. Your 14-week-old baby is likely pushing up more confidently during tummy time, reaching out to bat at objects, and rewarding you with social smiles that feel deeply intentional. This week often marks a turning point — the moment many parents realize their baby is truly seeing them, responding to them, and building... Read more...
Baby Clingy Phase: What's Normal
You finally manage to set your baby down — just long enough to pour coffee — and the wailing begins before your hand leaves their body. Your partner picks them up? More wailing. Grandma reaches out? Full meltdown. Somewhere around eight months, your formerly easygoing baby has become a tiny, tear-streaked barnacle who accepts exactly one person: you. It's exhausting, it's flattering, and it's one of the healthiest things your baby's brain can do. I remember standing in my kitchen at 9 months postpartum, holding my daughter with one arm... Read more...
When Do Babies Walk? The Milestone Every Parent Waits For
Is there a question parents Google more than "when do babies walk"? Those first wobbly, arms-wide steps are arguably the most anticipated milestone of the entire first year — and the one that generates the most comparison anxiety. Your neighbor's baby walked at 9 months. Your sister's walked at 14 months. Both are perfectly normal, and the gap between them illustrates just how wide the healthy range really is. Whether your baby is a daring early walker or a cautious late bloomer, this guide breaks down exactly what to expect,... Read more...
When Do Babies Roll Over? A Complete Month-by-Month Guide
Picture this: you set your baby down on a blanket for some floor time, step away for a moment, and return to find them facing a completely different direction. That first roll is one of the most exciting — and sometimes nerve-wracking — milestones in your baby's first year. If you're wondering when do babies roll over, you're not alone. It's one of the most common questions new parents ask, and for good reason. Rolling is your baby's first real act of independent movement, the foundation for every gross motor... Read more...
When Do Babies Crawl? Your Complete Guide to This Exciting Milestone
Did you know that roughly 50% of babies are crawling by 8 months, yet some perfectly healthy babies never crawl at all? This single statistic captures why the question "when do babies crawl" doesn't have a one-size-fits-all answer. Crawling is a major gross motor milestone — it's your baby's first real way to independently explore the world around them. But the timeline, the style, and even whether it happens varies more than most parents expect. Here's everything you need to know about when babies crawl, what different crawling looks like,... Read more...
Baby Week 15 Development: What to Expect
Something magical happens around week 15 — your baby starts laughing. Not just the polite social smiles of the past few weeks, but genuine, belly-deep laughter that catches you both off guard. Your 15-week-old baby is also becoming a small scientist, spending long stretches staring at their own hands, opening and closing their fingers with total fascination. This is the week of discovery: discovering their own body, discovering their voice has range beyond crying, and discovering that the world responds when they act on it. You might also notice your... Read more...
Baby Week 52 Development: What to Expect
One year ago, you held a newborn who could barely focus their eyes on your face. Today, your 52 week old baby walks across the room, says your name, hands you a book they want read, and laughs at jokes only they understand. Fifty-two weeks. Three hundred and sixty-five days of midnight feedings, first smiles, rolling over, sitting up, crawling, standing, and finally walking. The baby 1 year development milestone is not just another week -- it is the finish line of the most extraordinary year of growth a human... Read more...
Baby Week 42 Development: What to Expect
Picture this: your baby is standing in the middle of the room, no furniture within reach, no parent's hand to grip -- just standing there, wobbling slightly, grinning like they have conquered gravity itself. Then they sit down, crawl to the couch, pull up, and do it again. If your 42 week old baby has started standing independently, even for just a second or two, you are witnessing one of the most visually dramatic milestones of the entire first year. But the changes this week go far beyond balance. Improved... Read more...
Baby Week 41 Development: What to Expect
You set the remote control on the coffee table. Your baby cruises over, grabs it, looks you directly in the eye, and drops it on the floor. You pick it up. They drop it again. They are not being difficult -- your 41 week old baby is running a physics experiment with a side of social testing, and you are both the audience and the subject. Week 41 is when cruising between furniture becomes the primary mode of transportation, stacking blocks becomes a new obsession, and your baby starts understanding... Read more...
Baby Week 40 Development: What to Expect
There is a moment around week 40 that catches parents completely off guard. You hold out both hands, your baby grabs on, and then -- one foot in front of the other -- they walk. Not cruising along furniture, not lunging between couches, but actual forward steps with you as the guide rail. Your 40 week old baby is crossing a threshold this week, both literally and developmentally. Walking with support, speaking with intention, and showing you exactly what they want (and what they absolutely do not want) are all... Read more...
Baby Week 39 Development: What to Expect
The first time your 39 week old baby attempts to climb the stairs, you will feel two things simultaneously: pride and raw terror. One moment they are crawling across the living room floor, and the next they have planted both hands on the bottom step, hauled one knee up, and are reaching for the second step with the focused determination of someone summiting a mountain. Week 39 marks the arrival of the climbing instinct, a developmental leap that changes your daily life in immediate, practical ways. Your baby's balance while... Read more...
Baby Week 38 Development: What to Expect
You hand your 38 week old baby a wooden ring, and instead of mouthing it immediately -- the default response for months -- they study it, turn it in their hands, and then carefully lower it onto a peg. It misses. They try again. It lands. No fanfare from them, just a quick glance at you to confirm you saw it, and then they reach for the next ring. Something fundamental has shifted this week: your baby is becoming a problem-solver who plans actions before executing them, and their body... Read more...
Baby Week 37 Development: What to Expect
There is a moment around week 37 that catches nearly every parent off guard. You set your baby down at one end of the couch, turn around to grab a burp cloth, and when you look back they have already shuffled to the far armrest -- and they are reaching for the lamp. Your 37 week old baby is cruising with genuine speed now, and with that speed comes a boldness that transforms your living room into a daily adventure course. This is also the week when many babies begin... Read more...
Baby Week 36 Development: What to Expect
Nine months. Your 36 week old baby has officially been outside as long as they were inside, and the transformation is staggering. The tiny, helpless newborn you brought home is now a person who crawls across a room in seconds, pulls to stand like it is nothing, turns when you call their name every single time, and figures out how to get a toy out of a container they have never seen before. Week 36 is also a big one on the medical calendar -- the 9-month well-child visit is... Read more...
Baby Week 35 Development: What to Expect
If you have been counting the weeks since birth, here is one that deserves a mental bookmark. Your 35 week old baby is standing. Not for long -- maybe two seconds, maybe three -- but they are doing it without holding anything. Hands free. Wobbly knees. A look on their face that says, "I cannot believe this is happening either." At 35 weeks (about 8 months old), your baby is assembling an impressive toolkit: deliberate hand movements that actually accomplish what they intend, sound imitation that mirrors your speech patterns,... Read more...
Baby Week 32 Development: What to Expect
The floor is no longer enough. Your 32 week old baby has spent weeks mastering the horizontal world, and now they are reaching for the vertical one. At 8 months old, many babies transition from belly crawling to a proper hands-and-knees crawl, and some are already gripping the edge of the couch and hauling themselves upright. Object permanence -- the understanding that things continue to exist when hidden -- is clicking into place, which means peek-a-boo has graduated from a silly game to genuine cognitive exercise. You might also catch... Read more...
Baby Week 30 Development: What to Expect
You set your 30 week old baby down on the floor this morning, and instead of staying put, they pivoted, reached for a toy behind them, and then belly-dragged three feet to grab the remote control you thought was out of reach. Welcome to the week when sitting, scooting, and babbling all accelerate at once. At roughly 7 months old, your baby is building the physical strength and cognitive awareness that will define the next several months of development. The sounds pouring out of their mouth -- "mamama," "dadada" --... Read more...
Toddler Development Guide: Ages 1 to 3
The first birthday is a hinge. Your baby crossed 52 weeks, and now the word changes from baby to toddler — and so does almost everything else. The next two years are the steepest stretch of development your child will ever go through: first steps become running, a handful of words become hundreds, and a baby who played beside other children starts playing with them. Parents tell us the toddler years feel less like watching milestones tick by and more like holding on. This guide maps the whole arc from... Read more...
Baby Week 51 Development: What to Expect
Last week your baby was walking. This week, your 51 week old baby is trying to run -- a lurching, forward-leaning scramble that looks more like a controlled fall than an actual jog, but the intent is unmistakable. They have somewhere to be and walking is no longer fast enough. At approximately 12.5 months, your baby's physical abilities are accelerating alongside a fierce drive for independence that touches everything from meals to getting dressed. They want to climb the stairs by themselves, hold their own spoon, scribble on paper rather... Read more...
Baby Week 50 Development: What to Expect
You hand your 50 week old baby a stuffed bear, and instead of mouthing it or tossing it aside, they cradle it against their chest and toddle across the room -- walking, carrying, and pretending all at once. Two months ago, walking required every ounce of concentration your baby had. Now it is becoming automatic enough that they can do other things while doing it. At roughly 12.5 months old, your baby is entering a stage where physical confidence unlocks a cascade of new cognitive and social abilities. They are... Read more...
Baby Week 45 Development: What to Expect
The music started playing from the kitchen speaker and your baby stopped mid-crawl, sat upright, and began bouncing -- arms pumping, head bobbing, a grin spreading across their face. No one taught them to dance. No one demonstrated the moves. Your 45 week old baby simply heard a rhythm and felt compelled to move with it, and that spontaneous response reveals how deeply their brain is now processing auditory patterns, coordinating motor output, and experiencing something that looks a lot like joy. At approximately 11 months, week 45 brings a... Read more...
Baby Week 44 Development: What to Expect
You handed your baby a board book this morning and instead of chewing on it, they sat down, opened it to a page with a dog, looked up at you, and said "duh." Then they pointed at the dog and looked at you again, waiting. That tiny moment -- choosing a page, identifying an image, and seeking shared attention -- is the kind of cognitive leap that defines your 44 week old baby. At 11 months, week 44 is a period of balance breakthroughs, emerging comprehension, and a deepening love... Read more...
Baby Week 43 Development: What to Expect
Something funny happened this week -- literally. Your 43 week old baby looked at you, held a sock up to their ear like a phone, and waited for you to laugh. When you did, they did it again. And again. Welcome to the age of intentional humor, where your baby is not just absorbing the world but actively trying to get a reaction out of it. At roughly 11 months, week 43 brings a remarkable blend of physical confidence and social sophistication. Your baby is standing alone for longer stretches,... Read more...
Baby Week 25 Development: What to Expect
If last week felt like a whirlwind of new milestones, week 25 is where your baby starts refining those brand-new skills. Your 25 week old baby is not just sitting — they are sitting with more control, reaching for toys without toppling, and maybe even pivoting on their tummy to grab something interesting behind them. The babbling is getting more complex too, with chains of sounds that almost feel like real conversation. I noticed at this age that my little one started responding differently to a firm tone versus a... Read more...
Baby Week 24 Development: What to Expect
Week 24 is one of those weeks that feels like everything changes at once. Your 24 week old baby may be sitting up without support for the first time, tasting real food beyond breast milk or formula, and possibly cutting a first tooth — all in the same week. At six months, your baby's world is expanding rapidly. They are stronger, more curious, and suddenly very interested in everything happening around them. As a parent, I remember week 24 feeling like a turning point — my baby went from content... Read more...
Baby Week 23 Development: What to Expect
Something shifts at twenty-three weeks. Your baby is no longer content to sit and observe — they want to participate. If a toy is out of reach, they lunge for it. If a rattle makes noise when shaken, they shake it again and again, delighted that they caused the sound. Your 23 week old baby is roughly five and a half months old, and this week marks a transition from passive discovery to intentional action. I noticed this change during a Saturday morning floor session when my baby spotted a... Read more...