When would/did you feel comfortable letting baby sleep on their tummy? My ds has good head control and can move it from side to side but can only roll from front to back not back to front. He still suffers terribly with wind and if I put him on his tummy it obviously helps as he goes straight to sleep but then I have to flip him which wakes him up. He used to sleep on his tummy on my chest when he had bad wind but is way to heavy for that now. Does anyone know the reasons tummy sleeping is supposed to contribute to SIDS?