Eli5: Why does our eyecoulour change when we are toddlers? Why arent we straight up born with it?

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Eli5: Why does our eyecoulour change when we are toddlers? Why arent we straight up born with it?

In: Biology

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Because the melanocytes in the eyes responsible for secreting the melanin that makes up eye color aren’t activated yet.

Human development is a long complex process, not everything can start up right away after birth. Melanocytes become active at about 6 months of age.