That birthday-party moment
It’s your niece’s first birthday. Cake, balloons, a living room full of babies. And there’s the little guy from down the street, cruising along the couch like he owns the place. Yours? Sitting happily on the rug, chewing a napkin.
Then that little voice starts: Is my baby behind?
If you’ve felt that knot in your stomach, you’re in good company. It’s one of the questions our physical therapists hear most, and it almost always comes from a parent who’s paying close attention. That’s a good thing.
Part of the problem is the internet. When researchers reviewed 241 popular parenting websites, apps and books, they found nearly 7,000 milestone claims covering 146 different milestones. No wonder every source seems to say something different.
So let’s clear it up. Here’s what a pediatric PT actually looks at, what’s perfectly normal, and the few signs worth a closer look.
1. Milestones are a window, not a deadline
Think of milestones like a flight’s arrival time: it lands within a window, not at one exact minute.
Nearly every baby builds movement in the same order: head control, rolling, sitting, pulling up, then walking. The timing varies a lot. A baby who walks at 10 months isn’t headed for the Olympics, and one who walks at 15 months usually isn’t behind.
What we really watch is the pattern:
- Is your baby making steady progress from month to month?
- Are both sides of the body working equally?
- Once a new skill shows up, does it stick?
If the answer to all three is yes, take a deep breath. That’s what healthy development looks like.
2. The milestone cheat sheet (screenshot this)
Here’s what most babies can do by each age. “Most” is the key word: these are ages by which the majority of babies have the skill, so landing on the later side is common.
| Age | Most babies can… |
|---|---|
| 2 months | Lift their head during tummy time; move both arms and legs |
| 4 months | Hold their head steady without support; push up on elbows on their tummy |
| 6 months | Roll from tummy to back; push up on straight arms; lean on their hands to sit |
| 9 months | Sit without support; get into a sitting position on their own |
| 12 months | Pull up to stand; walk while holding onto furniture |
| 15 months | Take a few steps on their own |
| 18 months | Walk on their own |
| 2 years | Run; kick a ball |
Wait, where’s crawling? It’s not on the list, and that surprises a lot of parents. Plenty of babies scoot on their bottoms, roll across the room, or army-crawl on their bellies. Some skip crawling and go straight to walking. What matters is that your baby has a way to get around and explore.
3. The 5 signs a PT would want to see
None of these means something is wrong. They mean it’s worth a conversation with your pediatrician or a pediatric physical therapist, because the earlier you look, the easier it is to help.
- Head always turned the same way, or a flat spot on the head. This is often torticollis, a tight neck muscle. It’s one of the most common reasons babies come to PT, and it usually improves quickly when it’s treated early.
- Favoring one side. Always reaching with the same hand before 12 months, or crawling while dragging one leg.
- Feeling very stiff or very floppy when you pick your baby up.
- Losing a skill your baby used to have. Call your pediatrician about this one right away.
- Walking on tiptoes most of the time once your child has been walking for a few months.
4. Your car seat might be doing too much
Car seats, swings, bouncers and strollers are lifesavers. We get it: sometimes you just need both hands free to make dinner.
But babies build strength on the floor. When they spend long stretches strapped into “containers,” they miss that floor time. Therapists call it baby container syndrome, and it’s linked to flat spots, head tilt, and slower rolling and sitting.
The fix is easier than you’d think:
- The car seat is for the car. When you get home, move your baby to a blanket on the floor.
- Tummy time after every diaper change. A minute or two at a time adds up over the day.
- Get down on their level. Lie face to face on the floor. You’re your baby’s favorite toy.
- Put toys just out of reach. It gets them reaching, pivoting and rolling.
- Skip the baby walker. Pediatricians advise against them for safety reasons.
5. Your gut counts too
You see your baby every single day. If something feels off, that feeling matters. An evaluation is never a waste of time: at worst, you walk away with peace of mind. At best, you catch something early, when it’s easiest to help.
Quick answers to what parents ask us most
My baby was born early. Do these ages still apply?
For babies born prematurely, doctors usually go by “adjusted age,” counting from the original due date instead of the birth date. Ask your pediatrician what that means for your baby.
My baby hates tummy time. Is that a problem?
It’s incredibly common. Try shorter sessions, tummy time on your chest, or a rolled-up towel under the arms. A little, often, beats a lot of crying.
Do I need a referral to see a pediatric PT?
It depends on your insurance plan. Our intake team can help you find out.
How AMP can help
AMP Pediatric Therapy’s licensed physical therapists work with babies and children across Central Florida: at home, at daycare, or by telehealth when it’s a good fit. Children under 3 may also qualify for early intervention through Florida’s Early Steps program.
Wondering about your baby’s movement? Tell us about your child. One conversation could put your mind at ease.
Know a parent who’s been asking “Is my baby behind?” Send this their way.