Baby skulls are weird enough with their tiny little toothless maws, but things just get weirder as they age. Behold the living tooth factory inside every child's skull. Where did you think those permanent chompers came from? Here we see the deciduous teeth (or baby teeth) and the buried pearly whites that will replace them -- and hopefully last it throughout its adult life.
Infants and toddlers, on the other hand, get to experience the monstrous and painful eruption of fresh deciduous teeth right out of their pink, pulpy gums. The process makes life miserable for everyone involved.