My DD is 4 weeks old and so far has slept on her tummy due to horrible reflux. This was the only way she would settle without screaming. She is on ranitidine and reflux is massively improved, she quite happily lies on her back now so I am keen to nip the tummy sleeping in the bud if I can! At the moment she is not used to sleeping on her back so when she gets tired she gets cranky and I then have to flip her onto her tummy and settle her so that she can nap. I would love for her to be able to drop off to sleep for a nap just as she is! Has anyone successfully moved their baby from tummy to back sleeping at 4 weeks or later? Any tips?