Babies can start rolling over as early as 3 to 4 months old, with most beginning between 4 and 7 months. Typically, they first roll from tummy to back around 4 to 5 months and then from back to tummy a bit later, around 5 to 7 months. By 6 to 7 months, most babies can roll both ways confidently. Individual development rates vary, and some babies may roll accidentally earlier or later than this range. If a baby is not rolling by around 6 months or seems to have stopped rolling, consulting a pediatrician is advised to rule out any developmental delays. This milestone is important as it shows growing strength and mobility and precedes other movements like sitting and crawling.