There are lots of animals that we humans have distorted to fit our liking, to the point where they are so deformed that they suffer health problems because of it. Sadly, a lot of it is done for looks alone. Humans have bred the vaulted skull because they wanted a bigger crest. Nevermind that it's a deformity of the skull not closing all the way as it should, and leaves the birds' heads open and vulnerable at the top. It's like how flat-faced dogs can't breathe properly or dachshunds have back pain because of their midget legs. Most people are so used to it that they don't even notice how grotesque these animals look until they see them in a different context. Like, a silkie baby without all the fluff. Yes, it does look "wrong", because it is! But people have decided that it's not. So, this baby didn't suffer any particular trauma to its head, it suffered from breeders' selfish decisions on how to shape that head.