L.B.
I have allowed both of my young children to sleep on their tummies and I am at peace with it because I covered my mattresses to protect against sids. Many sids deaths are caused by the baby breathing a lot of a chemical found in the mattress. My covering them, the baby cannot breathe the chemical making it impossible to die from SIDS. To buy the mattress covers go to www.stopsidsnow.com Hope this helps!!!