My dd is 13 weeks old and a couple of weeks ago I noticed her head was flat on one side at the back. I probably should have picked this up earlier but she has a lot of hair which has masked things. I spoke to the health visitors about it and they said it should rectify itself once she starts sitting up and crawling. However, I want to stop it getting worse if I can. I've got a pillow to go under her head when she is on her back during the day and am putting all her toys on the side she doesn't normally turn towards. I'm also trying to get in plenty of tummy time. The only thing is at night time she always turns her head to the right when she's sleeping. I've tried turning it the other way when she's asleep but she always switches back. I've read that there is a mattress called sleepcurve which is meant to help. I was just wondering if anyone had tried these? They're quite pricey so thought I'd ask before buying anything.