Tummy time is very important for development - other ways to get tummy time is to place bubs across your knee, have bubs on your chest lying down or even just leaning back, carry bubs around in the aeroplane hold or even lay bubs tummy down on a swiss or beach ball and roll back and forth side to side - they say that even two seconds at a time is worth it for developing babies, then slowly you can stretch it out. Try every tme that you change bubs flip them over to their tummies for as long as they will stand it - then flip back over - at least that way you'll remember to do it and they get valuable tummy time...HTH...