My LO is almost 5 weeks old and we've had the WORST time sleeping. Today I discovered she is a  belly sleeper! She took a nap on her belly and did great! She has had amazing head strength since birth and can pick her head up! During tummy time she always turns her head to the side during breaks, and has never had a moment of "face down". I'm a FTM and not ready to let her attempt belly sleeping. I am just wondering when I CAN try this??