Here's why with human babies....
When a baby is first born, the eye still has not fully developed a dark pigment known as melanin that helps “color” eyes and skin. Blue or gray eyes (which many Caucasian babies have at birth) in a newborn mean that melanin is virtually absent within the eye’s colored portion (iris).
When your baby is about six months old, you’ll have a better idea of eye color as pigmentation begins to form and brown or darker eyes might appear. The baby’s eye color should be determined by about age one, although some individuals may experience eye color changes through adulthood.
People of Asian, African-American, Hispanic, or native American descent often have babies who are brown-eyed at birth because of darker pigmentation (melanin).
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