My DS is 5 and a half months old, and until today he has always slept on his back. However, today I put him down for two naps, and both times when I went to check on him, he had rolled on to his front to sleep? I have also just been to check on him this evening, and he is lying on his front again. It seems like he has just discovered that front sleeping is possible, and now he wants to do it! But I am a bit worried that it isn't a good idea? I know that SIDS advice says always on their backs, but as he is almost 6 months, is this still relevant to him? I keep rolling him back over, which makes me feel a bit mean as it disturbs him!