The average baby rolls over at around five or six months of age, but this is hardly a rule. Some babies roll over just after birth; others can’t be bothered to try until ten months of age.
A few factors come into play concerning this milestone. First and foremost is size; the more baby mass there is to roll over, the harder it will be. Then there are issues of coordination and muscle strength, which vary from child to child. Finally, there’s temperament. Some kids are perfectly happy on their backs and won’t attempt a roll until much later on, while wigglier ones try earlier. The whole fuss about rolling over comes from the fact that years ago, pediatricians recommended that kids be laid on their bellies while on the floor or in their cribs. Kids would try to lift their heads to look around for entertainment, of course, but also to improve their view by rolling over as soon as they were able. These days, kids spend the majority of time on their backs because doctors discourage the belly position for fear of SIDS. When Lucy’s on her back, she can look at you and play with her mobile, so why would she want to roll?
A friendly word of caution: Don’t underestimate Lucy’s ability to roll over; she may have more tricks in her bag than you suspect. The first time it happens could be the very moment Lucy is on her changing table and you turn your head for a split second.