My little girl has a very flat head, she was born like it because of how she was sitting in the womb. I've always been told to just keep her off her back as much as possible and that it would right itself once she sat up etc.
She's now 9 months and as flat as a pancake. Unfortunately she's been late to sit which hasn't helped. I've always been aware of helmets but wasn't convinced enough, considering that she would likely grow out of it anyway.
I've just got back from a general GP review and he agreed that her head is severe and that it's up to me whether I look into helmets, but he warned that it's probably too late now.
I'm so upset with myself and feel like I've neglected her. I did stick to the advice and I don't know why it didn't help. But why did I leave it this late before reconsidering the helmet 
Does anyone have experience? Especially those who either didn't treat with a helmet or those who did but left it late.