Mommies, who has experienced this?

Mommies, who has experienced this? My son, we've had this head shape for two days now. The middle one also had the same thing. I read a lot and I'm scared. Tell me what helped you fix the head shape. The middle one got better, he's 13 but the head is still not round. We have a butterfly pillow, but I think if I don't put the head on it, the rounded places will stay that way. Maybe on a flat surface should sleep? Thanks.