Comments from MIL

My mother in law came over this afternoon and within five minutes she said our son has a flat head and will probably need a helmet. She’s not a doctor - she’s a nurse practitioner. I’m feeling so upset and incredibly worried. I know his head shape has changed but I didn’t realize it was that bad. He sleeps on his back for 9 hours a night. I feel like he’s up and active during the day. I’m going to call the doctor tomorrow and follow up. In the mean time does anyone have any recommendations on how to help this situation or so it does get worse? Or any words to help me calm my nerves? Thanks so much