When Do Babies Roll Over?

Most babies roll from their tummy onto their back at around five months, and the CDC's six-month checklist names exactly that. Rolling from back to tummy is generally the later of the two, because it needs more strength through the shoulders and a deliberate push rather than a topple.

The AAP is direct about the order: most children roll from stomach to back before the opposite direction, and doing it in reverse is perfectly normal. Which way round your baby manages first is not information about anything.

Notice what the CDC does not list. Back-to-tummy rolling is not a milestone at any age, and neither is rolling before six months. That single six-month entry is the only rolling item in the whole checklist series, which is itself a statement about how variable the rest of it is.

Rolling comes out of tummy time, and quite literally so. The four-month checkpoint is pushing up onto the elbows and forearms while on the tummy; the six-month one is pushing up with straight arms. Somewhere between them, a baby pushing up on one side while reaching with the other arm discovers that the whole arrangement tips over.

That is why first rolls so often look accidental, and why they are so often followed by outrage. Arriving on your back without having planned to is startling. Within a week or two the same movement becomes deliberate and the complaints stop.

This is the part parents lose sleep over, and the guidance is more forgiving than it sounds. Babies up to a year should always be placed on their back to sleep, for naps and at night. Rolling does not change that.

What changes is what you do afterwards. Once your baby can roll from tummy to back and from back to tummy on their own, they can be left in whatever position they end up in. You are not required to go in and turn them over. The rule is about the position you put them down in, not the position they reach under their own power.

Two things follow from it. Swaddling has to stop at the first signs of rolling, because a swaddled baby who ends up on their front cannot use their arms to lift their head. And the crib stays as bare as it always was: firm flat mattress, fitted sheet, nothing else, which is now doing more work than it was last month.

Rolling is the end of putting a baby down on a raised surface and turning around. Changing tables, sofas, beds and the corner of a dining table with a towel on it were all fine yesterday on the single ground that your baby stayed put. Keep a hand on your baby on the changing table from the first roll, and change them on the floor when you cannot.

This arrives sooner than parents expect, because the first roll is often unwitnessed and the second one is a surprise. Treating a baby who has ever pushed up on one arm as a baby who can roll is the cheap way of being right.

Rolling is not worth counting days against, and the CDC listing it once is a hint about that. The things worth mentioning at a checkup are the ones that apply across all early movement: no rolling in either direction by around six or seven months, a consistent difference between the two sides of the body, stiffness or floppiness that seems out of the ordinary, or a skill that has gone away.

Babies who spend little time on their fronts often roll later, and more floor time is usually the whole of the answer.