In this article:
The Role of Melanin in Eye Colour
Melanin is a natural pigment that gives colour to your baby’s eyes, skin, and hair. The amount of melanin in the iris, the coloured part of the eye, helps determine your baby's eye colour.
If your baby has more melanin, the eyes are more likely to appear brown or dark. Lower levels of melanin are usually associated with lighter eye colours, such as blue or green.
How Genes Influence Eye Colour
Your baby gets genes from both you and your partner, and these genes help decide eye colour. Different genes work together, which is why eye colour can vary from one child to another. Your baby may have the same eye colour as you, your partner, or even a grandparent.
Sometimes brothers and sisters can have different eye colours. Since many genes are involved, it is not always easy to predict your baby’s final eye colour before birth.
Changes in Eye Colour During Infancy
Some babies are born with blue or grey eyes because their eyes contain less pigment at birth. This is more common in babies with lighter skin tones. As your baby grows, the body may produce more pigment, which can gradually change the eye colour.This is why your baby’s blue or grey eyes may become green, hazel, or brown. However, some babies keep the same eye colour as they grow.
When Does Eye Colour Become Permanent?
Your baby’s eye colour may continue to develop during the first year of life. In many babies, the eye colour becomes more stable between 6 and 12 months of age. However, some children may notice small changes for a longer time. Every baby develops at their own pace, so timing can vary.Can You Predict Your Baby’s Eye Colour?
Many parents try to guess what colour their baby’s eyes will be before birth. Your eye colour and your partner’s eye colour can give some clues, but it is not possible to know your baby’s final eye colour.Eye colour charts can help you understand the possible eye colours your baby may have. However, the following charts are only a guide and cannot predict your baby’s eye colour with complete accuracy.
| Your Eye Colour | Partner’s Eye Colour | Possible Baby Eye Colours |
| Brown | Brown | Brown, Hazel, Green |
| Brown | Blue | Brown, Blue, Green, Hazel |
| Brown | Green | Brown, Green, Hazel |
| Blue | Blue | Blue, Grey |
| Blue | Green | Blue, Green, Grey |
| Green | Green | Green, Hazel, Blue |
Can Twins Have Different Eye Colours?
Yes, twins can sometimes have different eye colours, especially fraternal twins. Since each baby inherits a different combination of genes, their eye colours may not always be the same.Identical twins usually have similar eye colours, but small differences can occasionally occur. This shows that every baby develops in their own unique way.
Does Eye Colour Affect Vision?
Your baby’s eye colour does not determine how well they can see. Babies with brown, blue, green, or hazel eyes can all have normal vision. However, if your baby seems very sensitive to light, has trouble focusing, or shows other vision problems, it is important to speak with your doctor. Eye colour itself usually does not affect eye health or vision.When Should You Speak to a Doctor?
You should speak to your doctor if you notice the following unusual changes in your baby’s eyes:- Your baby has eyes with two completely different colours
- One eye changes colour suddenly
- Your baby has very pale eyes, along with vision problems
- Your baby seems sensitive to light
- You notice cloudy eyes or changes in vision
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FAQs on How Do Babies Get Their Eye Colour? The Science Explained
- Can premature babies have different eye colour changes?
Yes, premature babies may experience eye colour changes differently because their eyes are still developing after birth. The final eye colour may take longer to become clear compared to full-term babies. - Can sunlight change my baby’s eye colour?
No, sunlight does not directly change your baby’s eye colour. However, different lighting conditions can make the eyes appear lighter or darker. Any changes in eye colour usually happen naturally as your baby grows and the amount of pigment in the eyes develops over time. - Can a baby’s eye colour skip a generation?
Yes, your baby may inherit eye colour traits from grandparents or other relatives. This is why some children have eye colours that differ from those of both parents.