It is estimated that the newborn's central nervous system contains the adult number of neurons, but subsequent brain growth and maturation add new neuroglia.

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At birth, the human brain already possesses nearly all the neurons it will have in adulthood. Brain growth and maturation post-birth involve the proliferation of neuroglia (glial cells) and the development of neuronal connections, rather than the addition of new neurons.

It Is Estimated That the Newborn's Central Nervous System Contains