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Fontanelles allow a baby skull to I’m social distancing Skull Fuck Off T-shirt change and head deformed at birth as it passes through the mother’s pelvis, a narrow socket in humans compared to other mammals. After birth, they no longer function. They form in all mammalian fetuses simply because the skull bone developed from separate fibrous membranes must grow together and form seams (stitches) where the skull is locked together. In most mammals, they close up before birth. New kittens and puppies, for example, don cages often have fontanelles. However, infants in humans are essentially born prematurely compared to other mammals and this process (such as calcification of joints of limbs) has not ended, as the picture on the left shows.
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They must be born early so that I’m social distancing Skull Fuck Off T-shirt skull bone changes during birth. Fontanelles are not needed to allow the brain to grow. Most of them are nearly 12 months old, although the previous large fontanelle can sometimes be palpable no later than 2 years. But even at 2 years of age, the brain is only about 80% of its final size. It continues to enlarge even when the fontanelles are closed and the bone is joined along with the stitches (for example, between the yellow forehead bone and the pink parallel bone above). Even at 5 years of age, the head is still only 90% of the size of an adult. Then how does it grow ?, you might be wondering. Bones can simply drift to allow brain development.