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Uncommon Knowledge: What makes babies eyes blue?

If you’re gazing into the eyes of a newborn baby, more often than not you’ll see they’re some brilliant shade of blue, whatever the color of their parents’ eyes. This happens because, when a child is born, its eyes are still building up their store of a protein called melanin. The more melanin that collects, the darker the iris will become. Not only that, melanin itself becomes darker with exposure to ultraviolet light. At around six months old, a baby’s eyes will usually reach the color they will retain for the rest of their life.

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Written by Nathan

Nathan is a copywriter, who helps create our product descriptions as well as our weekly emails. He is also a nationally award-winning musical theater writer, whose work includes an adaptation of Lois Lowry’s novel The Giver. Nathan has also been a classical violinist, tutored Kazakhstani jewelers in entrepreneurship, created large-scale games played across entire city blocks, served as a missionary in South Korea, conducted experiments in sonoluminescence, co-founded an exotic fruit-growing business, was a theater critic for Tucson Weekly, and as a teenager composed a women’s jazz quartet that is currently performed around the world.

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