The change of blue into brown or hazel color is due to the amount of melanin in our bodies. Melanin is a pigment that affects the color of our eyes, skin and hair. If you have more melanin your eyes, hair and skin will be darker. Thus, if there is a small amount of melanin in the irises of your eyes, they will be blue. A medium amount makes the eyes look hazel or green while a large amount of the pigment turns them brown.
Newborn babies don’t have the entire amount of melanin they are going to have once they grow up.
This means that the eyes’ color is subjected to changes until the child reaches two years of age. During this period the amount of melanin builds up and changes. In addition, exposure to ultraviolet light also affects the color of the eyes
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