DS has also taught himself how to roll from he's back to he's tummy (he learnt this only just yesterday and now he won't stop!) I almost had heart failure this morning at 4am when i went into he's room and found him on he's belly (it was he's first night out of the bassinette and in the cot) - i rolled him back and spent the rest of the morning running in there every 20 minutes making sure he was ok. I tried one of those sleep positioners but he seems to wriggle around until he pushes it down near he's legs and then its useless. I'm concerned as he is only just over 3months and doesn't really seem to have much neck control, i've looked into those Safe T Sleep things but not sure if its worth spending the money on one - has anyone else tried this product?