Both mine slept best on their tummies so that how they sleep all the time
My two boys would only sleep on their tummies. They just would not stay asleep on their backs.
Yeah my daughter is 5 weeks now and it's been a hassle getting her to stay asleep on her back. Whenever she naps I let her sleep on her stomach only because I'm right next to her to monitor her. @housfullofgrls
15m & 2.5m