Oh Nettie! You're a muso! I come from a long line of musos, and my 10 yo niece also plays the viola. I have four brothers, one drummer, a guitarist and a basist (the fourth is an artist). I'm getting DD into keyboard lessons this year.

They've found that babies heads get misshapen from constant back laying as the skull is still forming. It isn't good to be in only one position for a year or so, which is what some infants get put through from the SIDS stuff by their parents. Well meaning parents, but still. Imagine sleeping only on your back for a year? The best research so far shows that it is linked to bacteria in second hand mattresses (hence more second babies die of SIDS). So tummy sleeping puts them directly in line with that bacteria. Basically, if you have clean stuff, they're safe, because as long as they can turn their heads out of the way of any blockages, they will be safe (babies usually prefer tummy sleeping). For personal protection I must add: I do not recommend this. SIDS is not death by suffocation, they don't know what SIDS is. They do know that it is much more common in the western countries.