DD is 6 months old. She can nearly sit up, though her balance is not good, so she needs to be surrounded by lots of cushions. For the last few weeks, she has been able to roll from back to front. Unfortunately, she does not like to be on her tummy, and cannot roll back again. This might not sound much of a problem, but is frustrating for her and us, as she rolls over in her sleep, then wakes up crying. We go in, turn her over, only for her to flip straight back! In the daytime as well, as soon as she is put on her gym, or lying down, she rolls over, and then screams until we put her back on her back - only to roll straight back onto her front! What can I do to encourage her to learn to roll from front to back? Has anyone else had this, and how long does this stage last?