My boy is now 8 mths and he has gone through a few sleep positions. There were phases when he would be super restless in his sleep. Initially I would help place himself in a position I thought was his favourite until one fine day, by accident I realized he needed a totally different position to sleep. Now, he's in the phase where he can only fall asleep when he's hugged in an upright sitting position. Not something that I'm keen on doing but he falls asleep within mins of me doing that so I guess that's better than having him toss and turn for the whole hour in his bed and still not getting sleep.