My daughter definitely went through a period where I was worried, although we did lots of tummy time and also rotated sides of the head at nap and nighttime… I remember taking her in to the pediatrician just for that. She’s three now and although we never had a real issue, she doesn’t have the roundest head. 🙂
My daughter developed a flat spot on her head as a baby due to torticollis. Her neck muscle was weak / tight which caused her to constantly tilt her head to one side. That resulted in a flat spot, no matter how many times I tried to reposition her or how much tummy time we attempted. Her physical therapist referred us to a pediatric craniofacial doctor who recommended that she wear a helmet, as her forehead was also beginning to protrude. We were also told that if left untreated it could potentially deform the face and cause problems with her vision, sinuses, and jaw. I’ve since read that some doctors disagree with this. She wore the helmet for about 5 months. Looking back, I sometimes wonder if the helmet was really necessary. But at the time, when being told that your child has a “deformity” that may cause other issues, you do whatever you think will help. My daughter is 2 now and in my eyes she has the most beautiful little head I’ve ever seen, no matter what it’s shape!