What Eye Color Will My Baby Have? Math For Pregnancy Prediction

What color will your baby's eyes be? Image by Mike DeHaan

What color will your baby’s eyes be? (Click to expand) Image by Mike DeHaan

Although the main question expectant parents ask is, ‘Will my baby be healthy?’ it’s also fun to ask other questions – such as, ‘What eye color will my baby have?’

Baby Eye Color Predictor

How can we predict a baby’s eye color?

We expect that a Caucasian baby will have gray or blue eyes at birth, since the color pigments have not yet developed fully, and usually African and Asian babies have brown eyes from birth.

By nine months, most Caucasian babies settle into their adult color: blue, brown, green or hazel. Some children will change eye color all the way up to age three, so don’t get too comfortable with your baby’s eye color until he or she is in preschool, it could still change!

Regardless of the eye color your baby ends up with later on, but before he or she is born, there’s no way to know for sure. Can you The question, however, is to predict your child’s eye color before birth, based on the parent’s genetic legacy? Let’s start with the classic “blue versus brown” match-up, and deal with the simplest situation.

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Genetics: Alleles and Genes and More

Mendel’s principles of genetics are fairly well-known for dominant versus recessive genes. Each gene consists of a pair of alleles. Each parent donates one allele, so the child inherits a pair of alleles. The chart in the image above is a essentially a Punnett square.

A person with two dominant brown alleles, ‘BB‘, will have brown eyes. Another, with two recessive blue alleles, ‘bb‘, will have blue eyes. The brown dominance means that a mixed gene, ‘Bb‘, will be expressed as brown-eyed. Two blue-eyed people will have a blue-eyed child. Since the parents must each have a ‘bb’ gene, they can only pass ‘b’ alleles to the next generation. However, brown-eyed parents have either a ‘Bb’ or a ‘BB’ gene. You only know that a brown-eyed person has a mixed ‘Bb’ allele if that person had one blue-eyed parent.

From the chart, we can see that a child with brown-eyed parents has one chance in eight, or 12.5%, of being blue-eyed; and then only if one parent has some possible blue-eyed ancestry. Again, a mix of blue-eyed and brown-eyed parents has a “2/8=1/4=25%” chance of a blue-eyed child.

However, there is no guarantee that the situation will be quite this simple. Hazel and green eye color can both result from a weaker “brown” contribution.

Blue Eyed, Brown Eyed, Hazel or Green?

When you’re pregnant, it’s natural to wonder what your new baby’s eyes will be like, not to mention whether you’re having a boy or a girl, or how tall will she be. Although there’s no way to know for sure, you can use math to calculate the chances of brown eyes vs. blue, and more.

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  1. My husband has hazel eyes and I have dark brown eyes — thanks to my mom having bright green eyes and his mom having crystal blue eyes, we had one child with brown, one with hazel, one with green, and one with blue eyes!

    • This is impossible. There is no way your recessive genes would have overpowered your dominant genes in such a frequent manner.

      • Youre an idiot. Recessive genes dont run out. Each child has equal opportunity to have a recessive eye color. And it just happened to work out the way it did. Just against odds, and entirely possible. Try taking biology again.

      • dcbandana says:

        You are so wrong on this. I have three cousins that are sisters. The oldest is a red head with green eyes, the middle is a brunette with blue eyes and the youngest is a blonde with blue eyes. They father is a brown eyes brunette and they mother is a blue eyes blonde.

      • I have hazel eyes, my husband has dark brown eyes and our daughter has blue. Recessive genes.

      • Actually it is possible! Lots of amazing things happen I guess! My cousin has very dark brown eyes and her husband has dark brown eyes as well but his mother has blue eyes. They have two sons now one with blue eyes and one with dark brown eyes!

    • I want my baby eye’s colour green.. for this what can I do ? Please suggest me . Now a days science can do anything then I want my baby eye colour green colour .


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  2. […] “What Eye Color Will My Baby Have? Math For Pregnancy Prediction” covers the odds for your baby’s eye colour. That, of course, depends on the parents as well as the luck of genetic inheritance. […]

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