When Do Babies Start Crawling?

The hands-and-knees crawl is the one in the illustrations, and plenty of babies never do it. Commando crawling drags the body along on the forearms. Bear crawling keeps the legs straight so the bottom stays high. Bottom-shuffling moves a seated baby across the room without any crawling at all, and rolling gets some babies everywhere they need to be for weeks.

All of these are travel, which is the part that counts. A baby who has worked out that they can change their own location has made the cognitive step; the limbs are just the implementation.

The CDC's checklist for nine months names four movement milestones: getting into a sitting position without help, moving an object from one hand to the other, raking food towards themselves with the fingers, and sitting without support. Crawling is not among them, and it does not appear at any other age either.

That is deliberate. The checklists list what most children do by a given age, and crawling is too variable to sit in that category: too many typical babies skip it, invent something else, or do it months later than the average without anything being wrong. Leaving it off is a statement that its absence, on its own, is not a warning sign.

Two things carry more information than the style. The first is whether your baby uses both sides of the body roughly equally: a consistent preference for one side, or one arm or leg that does noticeably less work, is worth mentioning. The second is direction of travel over time, meaning that whatever your baby could do a month ago, they are now doing more of it or something beyond it.

Floor time is the one thing that reliably helps, and it helps because it is practice rather than because it is training. A baby who spends their waking time in a seat, a bouncer or a carrier has fewer hours to work the problem out.

Pulling up to stand usually follows crawling within weeks, which is the month to lower the crib mattress and look at the room from floor level. Cruising, which is walking sideways while holding onto furniture, comes next and is the usual route to walking.

Walking itself has a famously wide range, roughly nine to eighteen months, and a baby who crawled late very often walks on time.

Bring it up at your next checkup if your baby is not moving themselves across the floor by any method at all by around a year, if one side of the body is consistently doing less than the other, or if a skill your baby had has gone away. None of these mean something is wrong; they mean the question is worth asking someone who can watch your baby move.