My dd did that for a few days and then stopped doing it she slept in her hammock, quiet often on her side till she was 8 months when she learnt to roll face down in it. What type of hammock do you have mine was an amby. Bub also used to sleep with head/face against the side all the time to but was fine. getting on there side is not a huge thing but rolling face down is as it is realy hard to get back again.