Both of my kids have funny shaped heads. Both are AP babies.
Abi developed a very flat head in the back. I'm not sure why since she spent a lot of time in the sling with full control over her head, not having it rest on anything.
All I can think is for the first 6 mos. of her life she had reflux and I often sat her in the carseat carrier to let her settle for 30 mins. after eating. She slept in it at night sometimes, too, for the same reason. But even after we stopped doing that she had a flat head. I think because parents are told to put their babies to sleep on their backs, we are seeing more flat heads. I dutifully put Abi on her side but she always rolled to the back again, even with the positioner.
She narrowly avoided the helmet. She would have gotten one if the flat back was affecting the shape of the front of her head. Even at age 4, if I am standing over her rinsing shampoo off her head I can see that it's still very flat in the back.
Nitara had torticollis at birth (her neck tendons/muscles were pulling her head to the right) and she always rested her head on that side in the carseat, sling and in bed. She developed a flat spot on that side of her head. It was corrected with exercises by 3 mos. old but at 11 mos. she still has a flat spot. It's not that obvious so no helmet for her.
I ran into a baby at CostCo the other day who was wearing one. She was special needs and I got to talking to the grandma since Nitara is also special needs. That girl had something wrong with her eyelids at birth so she couldn't open them well. She was always tilting her head back to see things better and that's how her head got flat, before the surgery to correct her eyelids.
I used to judge a lot, with many things, until it happened to me.