Baby Week 28 Development: What to Expect

25 de julio de 2025|Poco Koko Team

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 they are about to launch forward but cannot quite figure out the next step. They are also beginning to understand simple words, turning toward the door when you say "daddy's home" or looking at the dog when you say its name. And then there is the other side of this cognitive leap: stranger anxiety is intensifying, and your formerly easygoing baby may suddenly scream when a well-meaning relative reaches for them. Here is what is driving all of it, and what you can do to help.

Quick Answer

At 28 weeks (7 months), babies often transition into sitting from a lying position on their own, rock on hands and knees as a pre-crawl movement, begin understanding familiar words, and experience a peak in stranger anxiety. This week is about building independence and processing social complexity.

What's Happening at Week 28

Physical Development

Getting into a sitting position independently is a significant motor milestone. Up until now, your baby needed you to place them upright. This week, many babies learn to push up from their side or roll from their belly into a seated position on their own. According to the American Academy of Pediatrics, most babies sit without support by 7 months and can get into the sitting position by themselves around this time. The other big physical development is rocking on hands and knees. Your baby gets up on all fours and sways forward and back, sometimes for minutes at a time. This is not aimless -- it is their nervous system rehearsing the alternating limb pattern that crawling requires. Some babies rock for a week before crawling; others rock for a month or more.

Cognitive Development

Word comprehension is quietly blooming. Your baby does not speak yet, but they are building an internal vocabulary of frequently heard words. Research cited by the CDC milestone tracker indicates that by 7 months, babies respond to familiar words in context -- they look at a cup when you say "cup" during mealtime, or glance at the window when you say "outside." This receptive language is the invisible foundation for the expressive language that will emerge in the months ahead. Your baby is also improving at tracking objects that move out of sight and may search briefly for a dropped toy, a sign that object permanence is strengthening.

Social and Emotional Development

Stranger anxiety typically peaks between 7 and 10 months, and your 28 week old baby may be right in the thick of it. This is not a regression -- it is proof that your baby now clearly distinguishes familiar people from unfamiliar ones and has developed a strong attachment preference. They may cry when handed to someone they do not see regularly, cling to you in crowded places, or bury their face in your shoulder when a new person approaches. The AAP reassures parents that this is a healthy and expected phase of social-emotional development, not a sign that something is wrong.

Best Activities for Week 28

1. Sit-Up Practice from Side-Lying
Lay your baby on their side with a toy just above and in front of them. Gently guide them through the motion of pushing up to sitting if they have not figured it out yet. Once they get it, the sense of accomplishment is visible -- and they will practice it relentlessly on their own.

2. Rocking Encouragement
When your baby gets on all fours and rocks, place your hands gently against their feet to give them something to push off from. This slight resistance can help the rocking translate into a first forward lunge. Do not force it -- just provide a surface. Many crawling breakthroughs happen exactly this way.

3. Name-That-Object Game
During daily routines, deliberately name objects as you interact with them. "Here is your bottle. Bottle." "Look, the ball. Ball." Then pause and see if your baby looks toward the named object. This simple repetition is how receptive vocabulary grows. I started doing this with everyday kitchen items during dinner prep, and within a couple of weeks, my daughter was clearly tracking certain words.

4. Gentle Stranger Introduction
To ease stranger anxiety, let new people approach slowly and talk to you first rather than immediately reaching for your baby. Give your baby time to observe the new person from the safety of your arms before any handoff. Forcing the interaction increases distress; patience reduces it.

5. Push-and-Pull Toy Play
Offer toys that roll, slide, or can be pushed across the floor while your baby is on all fours. Watching a ball roll away from them during rocking may be the motivation they need to shift weight forward and make a first crawling move.

Creating the Right Environment

The transition from rocking to crawling can happen at any moment this week, and it often happens fast -- one second your baby is swaying on all fours, the next they have lunged forward and face-planted. The surface beneath them determines whether that first attempt ends in triumph or tears.

A PocoKoko memory foam play mat provides the firm-but-forgiving surface that this developmental stage demands. The 1.3 inches of CertiPUR-US certified memory foam cushions the knee impacts of rocking and absorbs the inevitable forward tumbles when crawling finally clicks. The non-slip base prevents the mat from sliding when your baby pushes off, and the wipeable cover handles the drool, spit-up, and snack debris that follow a 7-month-old everywhere. It creates a defined safe zone where your baby can practice the hardest physical work of their young life.

28 week old baby rocking on all fours on PocoKoko memory foam play mat preparing to crawl

When to Talk to Your Pediatrician

A wide range of normal exists at 7 months. However, the AAP suggests contacting your pediatrician if your baby cannot sit with support, does not bear weight on their legs when held in a standing position, does not reach for objects, does not respond to sounds or voices, or shows no babbling at all. Persistent one-sided movement -- consistently favoring one arm or one leg -- is also worth mentioning. Stranger anxiety, even when intense, is not a concern; it is a sign of healthy attachment. When in doubt, your pediatrician would always rather hear from you early than late.

FAQ

Is it normal for a 28 week old baby to not crawl yet?
Yes. While some babies are rocking on all fours or even crawling at 7 months, many do not begin crawling until 8-10 months. The AAP emphasizes that the range for crawling onset is wide and that some babies skip traditional crawling entirely. Rocking on hands and knees is a strong sign that crawling is on the horizon, but there is no fixed deadline for when it should happen.

How do I handle stranger anxiety in my 7 month old?
Stranger anxiety is a normal developmental phase that peaks between 7 and 10 months. The best approach is patience: let your baby warm up to new people gradually, do not force them into unfamiliar arms, and reassure them with your calm presence. Acknowledge their feelings rather than dismissing them. Most babies move through the most intense phase within a few months as their social world expands.

What foods can a 28 week old baby eat?
At 7 months, most babies are ready for a wider variety of solid foods including pureed or soft-mashed fruits, vegetables, grains, and small amounts of protein like pureed chicken or mashed beans. Finger foods like soft banana pieces or avocado strips can be introduced if your baby shows readiness. Breast milk or formula should still provide the majority of calories. Always introduce new foods one at a time and watch for allergic reactions.