Color of eyes in newborns

First, let's look at what thecolor of human eyes. The color of the skin, hair and eyes of a person depends on the pigment content of melanin. Melanin absorbs ultraviolet rays and protects us from radiation damage. That's why people with fair skin burn faster in the sun than people with dark skin: less light skin than melanin. The color of the iris depends also on the melanin content, as well as the density of the iris fibers.
Basic eye colors - it's blue, blue, gray, green, amber,marsh (nut) and brown. The owners of blue and blue eyes, the content of melanin in the iris is the smallest, the owners of brown eyes - the largest. The notorious "black eyes" are dark-colored eyes. In albino eyes red, this is due to the fact that in their body melanin is not at all, so the color of the iris is determined by the color of the blood vessels.
The color of the eyes (or rather, the amount of melanin) is a genetically determined sign. The dark color of the eyes is dominant, and the light color -recessive, so dark eyes are more common. The most common color in the world is brown, and the rarest is green. Another color of the eyes depends on the region of residence - different peoples have different frequency distribution of certain eye colors. For example, if about 30% of Russians have brown eyes, then Ukrainians already have 50%, while among Hispanics this figure is as high as 80%.
Of course, this is a simplified scheme, inheritance of eye color is much more complicated, but in any case brown-eyed child with light-eyed parents can not be born (but on the contrary - it is quite realistic). There is a table that helps to determine what color the eyes will have in the child, based on the color of the eyes of his parents. But in most cases, several variants are possible with different probability, so the most accurate way to predict the final result is for the child of two blue-eyed parents.
Parent's eye color</ sup> | The color of the child's eyes (probability) | |||
---|---|---|---|---|
Parent 1 | Parent 2 | Brown | Green | Blue |
Brown | Brown | 75% | 18.75% | 6.25% |
Green | Brown | 50% | 37.5% | 12.5% |
Blue | Brown | 50% | 0% | 50% |
Green | Green | <1% | 75% | 25% |
Green | Blue | 0% | 50% | 50% |
Blue | Blue | 0% | 1% | 99% |
But even if the child was born with bright eyes, this is not necessarily permanent. Over time, the color of the eyes in newborns can change. This is due to the fact that special cells(melanocytes) do not immediately begin to produce melanin, and the accumulation of pigment in the body goes gradually. A child born with gray eyes, may eventually become brown-eyed. The eyes of the child can finally accept a normal color in half a year, a year, and even in two or three years. It also happens that a child is born with dark skin and dark eyes, and the color of the eyes does not change.
It is worth remembering that the color of the eyes in newborns changes due to the accumulation of melanin, so the eyes can turn from light to dark, but from dark to light - no (except that in the body of the child there was a malfunction that violated the production of melanin).
It also happens that the child's eyes have a different color: one is colored more strongly, and the other is weaker. This phenomenon is called heterochromia, and it is related to the relative excess orlack of melanin. There is also partial (sector) heterochromia, when the iris of one eye is differently colored, but this is a more rare phenomenon than complete heterochromia.
Heterochromia can be caused by various causes. Sometimes, in addition to changing the color of the iris, it does not manifest itself in any way, and sometimes it can be accompanied by complications right up to the cataract. therefore people with heterochromia should be observed regularly with an ophthalmologist.
So that changing the color of the iris in a child from light to darker is normal, the color of the eyes in newborns usually changes due to natural physiological processes. But the "multi-colored" eyes should alert.














