Salsa - I put DS to sleep on his belly from about 4 weeks. We coudlnt get him to sleep at all on his bakc due to colic and reflux.

Only now that he is almost 4 months will he settle on his back.

He has very strong neck muscles and can lift his head from side to side back at 1 month old - i did though borrow a breathing monitor for peace of mind overnight.

Where are you located?