We've registered for and received a Rock n Play, but now I have been reading reports of extended time leaded to a flat head and other issues including the need of a helmut to discuss said issues. I imagined that we would use the Rock n Play for nap time and maybe even initially as a next to the bed sleeper. Has anyone faced this issue or had feedback from a pediatrician about how much use of the Rock n Play is safe for baby? Obviously, tummy time and lots of time outside the sleeper is planned, but I am now getting a little freaked out by some things I am reading. If you use/d the RnP, did you put something soft under baby's head to avoid such issues? Thank you for any insight you can offer a FTM!