When do babies eye color change?

The natural evolution of baby eye colors 

Whether you're hoping your little one inherits grandpa's baby blues or wondering whether those gorgeous brown irises will darken as your child grows older, baby eye color change is a hot topic for parents everywhere. Because a baby's eyes change a lot in that first year (along with everything else about them), it's hard to predict the final hue. Your newborn's eye color doesn't affect what they can see, so there's no need to worry about vision issues related to a specific shade or how long the change takes.

Introduction to eye color changes 

A baby's eye color isn't easy to predict because there are lots of genetic factors involved. Sometimes, it takes years for eyes to change color, so you may not know your child's final eye shade for a while.

The typical timeline 

The natural shift in eye color over time is most noticeable between 6 and 12 months of age, but the process can take up to three years for some children, and a few are born with a shade close to their future adult eye color. In some rare cases, eyes will continue to change color subtly into adulthood. Most kids' eyes are close to their final shade by the time they hit that first birthday, though.

Factors influencing eye color change 

A few factors influence the color of a baby's eyes. The biggest is typically genetics. 

Genetic influences 

Genetics are the primary driver of eye color. This doesn't mean your baby will have the same eye shade as mom or dad, though. It's true that some colors are more dominant than others, but hidden recessive genes can pop up unexpectedly. There are at least 15 genes identified as affecting eye color, so you never really know what you'll get.

Melanin production 

The biological basis of eye color has to do with melanin production. Melanin is a protein that causes cells to darken in color, and the more you have in your eyes, the darker the color is. So, someone with lots of melanin has brown eyes, while someone without much melanin has light blue eyes.

Melanin production takes a while to ramp up. As the baby grows, melanin increases, adding darker shades to the original color. This is why a baby's eyes may darken over time but never get lighter.

External factors 

Melanin production turns on when eyes or skin is exposed to sunlight, so early sun exposure could speed up the process of eye color change. The amount of the change depends on genetics, though, so you can't make their eyes darker by taking your baby out into the sun all the time. 

Signs of baby eye color change 

Eye color changes in a baby tend to occur fairly slowly, so the hue doesn't suddenly switch from one color to another. 

Observable changes 

The only real visible sign of eye color change in babies is, no surprise here, the actual color of the eyes. You might want to record the changes in a baby book or through photographs to document the shift. There's no way to predict how much your child's eyes might change or how long the process might take.

Patience and monitoring 

If you're trying to monitor your child's eye color shift, patience is key. (Patience is literally the key to everything with babies. And toddlers. And school-aged kids. And teens.) You might look at your baby one day and think, wait, are your eyes a different color? But because it happens so slowly, photographs may be the only way to see changes over time. You can't really identify color changes from one day to the next, but a series of photographs or a digital slideshow could give you a good timeline. Start snapping one a day to catch the process in action.

Your baby's eye color transformation journey

While the shift in a baby's eye color can be slow and hard to document, it can be fascinating to observe in any way you can. The heavy genetic influence means you can't do much to affect the final outcome, but guessing what color peepers your little one may eventually have can be a fun activity for parents, grandparents, and siblings. (Is it wrong to take bets? Maybe.)

While watching your baby's eyes change color, make sure you take care of your own. You can take an online eye exam to renew your prescription and have contacts delivered right to your door.

Frequently asked questions

When do most babies' eye colors start changing? 

Babies eyes can start changing color soon after birth, but the most prominent shift occurs between 6 and 12 months of age.

Can the eye color change back after it has already changed? 

Eye color doesn't change back or become lighter over time, so once a baby's eyes have shifted in color, they don't revert to the original shade.

Are there any predictors for a baby's final eye color? 

You can guess your baby's final eye color based on the initial shade at birth and the eye colors of the parents, but there's no real accurate way to predict a baby's eye color.