See a cranial osteo and the sooner the baby.
My 15month old..oh my goodness..I cried most days about his head. It was totally flat and all to one side. He started seeing an osteo at 9 weeks and I wish wish wish I'd taken him earlier. If I have baby no 3, I will be taking them from 1 day old just in case!!!
However DO NOT (repeat!) get a helmet. They are proven not to work. Why you would saddle a baby with the trauma of a helmet that is uncomfortable, hot etc etc I have no idea :( Obviously makes the parents feel better that they're doing something (and paying a lot of money for the privilege) but cruel for the baby imo.
I have read at least 3 articles in The Daily Mail (!) of babies with 'horrendously' mis-shapen heads, whose mums have done a 'go fund' me type thing to pay out the £2k for these things. Not one of these baby's heads was as bad as my sons.
Anyway. Fast forward. He now has hair. That helps. Enormously. You now would genuinely not notice. I notice. Especially when his hair is wet, but then I'm looking for it. i'm fairly certain as he gets older it will get even better.
The paed I was seeing (for other issues) pointed out to me that most people have very weird shaped heads. So I started looking. He is right. He also said it's nearly criminal that you are charged £2k for a helmet. The reason the NHS don't really offer them is because they do not work. The head will nearly always sort itself out. Certainly, it wasn't something I wanted to subject my son to.
Anyway. I'm rambling. See an osteo and now. Our osteo was amazing. I think we saw her until he was 10 months old and then I realised myself time would sort the problem that was left.