Teagz - my son would only sleep on his tummy from only a few weeks old!! i swear that the first few nights I must have slept with one eye open on him. Caroline will sleep during the day on her tummy but for some reason (so far) she will sleep on her back at night. I'm sure this will change anytime now. anyways, it's something to think about - how's his neck strength? when Caroline wakes up from sleeping on her tummy she lifts her head up and calls out to me (as such) so maybe he'll be okay?