I would get it checked by a peadiatric chiropractor. The baby who was next to Kyla in the SCN would always cry when they put her on one side and roll back to the other, so they would put something there to keep her on that side to stop her from getting a misshaped head. weeks later the mum found out that her bub had a dislocated shoulder and that was why she cried - better to be safe than sorry.