need help

lex
Hi there, so my baby just turned 3 months and noticed her little head on the back is getting flat. Has this happend to anyone else's baby? And what are some tips You guys recommend? I never really lay her on her side since she moves a lot now and I'm scared she can roll over on her face. What are some tips you guys did or something you guy recommend. She's only 3 months so she still sleeps a lot & when she's awake I do carry her but sometimes I do lay her back down just so I can get things done and it mostly on her swing. Also could it be the swing that's causing this? that's where she lays most of the time. Thanks