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Why are babies born with blue or gray eyes

Why are babies born with blue or gray eyes


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One of the first things that catches the baby's attention are his clear eyes, especially if the eyes are dark in the family ... How long will the baby have clear eyes? Will your eyes stay like this forever?

Babies usually have bluish-gray eyes, but the color will most likely darken,until having its final color at 6 or 9 months of age.

If the baby already has dark brown eyes at birth, they will maintain that color or may even darken to black. Babies who have the lightest, gray or blue eye color will gradually darken, and will have its final color between 6 months or even a year.

The color of the iris (the colored part of the eye) is due to melanin. This is a protein, secreted by melanocytes, which gives color to the iris, hair and skin. In the newborn, the melanin-producing cells, the melanocytes, are still immature, and they produce little melanin. As the months go by, this melanin production increases and thus the skin, hair and eyes darken.

There is a popular belief, which relates the light color of the baby's eyes with the duration of breastfeeding. That is, there are people who think that the light color of the baby's eyes is caused by breastfeeding. There is actually no scientific basis for this thinking. What happens is that if the usual duration of breastfeeding is 6 to 9 months, it can coincide with the darkening of the baby's eyes due to the maturation of melanocytes.

Exposure to the sun does seem to be related to the activation of melanin production by melanocytes. Even in some adults the color of the eyes can change depending on their exposure to the sun. In the newborn they are clear because they have been in darkness for the first months in the womb.

The final color is largely determined genetically, but external factors such as light are probably also influenced. As time goes by, if the melanocytes secrete a small amount of melanin, the baby will have blue eyes. If the amount is a little higher, the eyes will be green or honey or hazelnut. If the secretion of melanin is greater they will be brown or dark brown or black.

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Video: Why? Tell Me Why! Baby Blue Eyes (May 2022).