My baby for the last year has slept on his back or side, but just lately seems to favour sleeping on his tummy, I have turned him on his back while asleep but this disburbs him and takes ages to get him back to sleep. He seems to sleep better when on his tummy then on his back at the moment, not sure why. However my question is that I know the advise for young babies is that they should sleep on there back, but once they reach 1yr is it safe/ok to sleep on tummy?