it's just a little flat on top because children are born without their skull completely intact so they have a soft spot on the top of their head because the skull hasn't fully developed there yet
Which is typical in every single child born, which is why these helmets are dumb. That soft spot grows solid and these helmets are a way for doctors to get money.
Although this is cool, these types of helmets are completely ridiculous. If your child is held and played with constantly, instead of kept in a car seat or crib all day, your child's head isn't going to end up being flat when they grow up. These helmets have become such a fad, it's preposterous!
That helmet is a medical correction device for a congenital deformity, not a fad, you fucking insensitive dipshit.