yeah, i would say be very careful... we put cade on his tummy ONLY because he has a monitor hooked up to him from the hospital...my pediatrician says that is the only reason we can since the alarm goes off if there is a pause in breathing longer than like 20 seconds or his heart rate dips... (which is the same technology they have in the hospitals and that is why the babies there sleep on their tummy...
babies do just get used to their back the more they sleep on it...
you can purchase the Angel Care Monitor that other people on this board have reccomended...
Angel Care