Did your (or your child’s) eye color change? Eye color changes a lot more than people think. Eye color was examined in the Louisville Twin Study which spanned decades. They found that 10-15% of subjects had a change in eye color into adolescence and young adulthood. A study at Stanford found that a baby’s eye color can change up until they’re 6 years old! 40% of blue eyed babies did get darker by the time they were 2. Most brown eyed babies remained brown. When babies are born, their melanocytes in their iris don’t have much melanin. Natural light triggers melanin production and that’s why most light eyes turn hazel or brown as babies get older. And, contrary to what we were all told in science class, it’s not just one gene that’s responsible for eye color. Scientists used to think it was just a simple inheritance pattern that would determine eye color - recessive or dominant. But, now we know that eye color is more complex and depends upon multiple genes. This is why two blue eyed parents CAN actually have a brown eyed kid. Did you or your baby’s eye color change?? Eye color changes past early childhood. The Louisville Twin Study https://doi.org/10.1001/archopht.1997.01100150661017 What Color Are Newborns’ Eyes? Prevalence of Iris Color in the Newborn Eye Screening Test (NEST) Study doi:10.1001/archopht.1997.01100150661017