banging head on the crib

Christi
FTM..my lil guy is a crazy sleeper he rolls all over his crib..the problem I'm having is him hitting his head in the crib when he's asleep..is anyone else having/had this problem with their lil one? He's 7mos old and has been in a cranial helmet for plagiocephaly (flathead syndrome) so he's had his helmet to protect him at night but now he's out of the helmet and has no protection from banging his head on crib slates..we have no bumpers in the crib either..thank you appreciate any feedback