Baby Eye Size Development

Baby Eye Size DevelopmentSource:

As a new parent, you’re likely curious about your baby’s development. One area that you may be wondering about is your baby’s eyesight. Understanding how your baby’s eyes develop can help you know what to expect and when to speak to a doctor if something seems off.

Development of the Eye

A baby’s eyes begin to develop just a few weeks after conception. The eyes start as small, bulging buds on the side of the head and then move to the front of the face. By the sixth week of pregnancy, the retina has formed, and the eyes begin to respond to light. Over the next few months, the iris, cornea, and lens develop, and the eyes become more complex.

Size of the Eye

At birth, a baby’s eyes are about two-thirds the size of an adult’s eyes. The average newborn’s eyes are around 16mm in diameter, while the average adult’s eyes are around 24mm in diameter. However, the eyes grow rapidly during the first few years of life.

By the time a baby is one year old, their eyes are about 75% of the size of an adult’s eyes. By three years old, they’re almost fully grown. At this point, a child’s eyes are around 23mm in diameter, which is just slightly smaller than an adult’s eyes.

Vision Development

A baby’s vision is limited at birth. They can only see objects that are 8 to 10 inches away and can’t differentiate between colors. However, as their eyes and brain mature, their vision improves.

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By the time a baby is six months old, their eyesight has typically improved significantly. They can see further away and can differentiate between colors. By nine months old, they can typically see as well as an adult.

When to Speak to a Doctor

While most babies’ eyes develop normally, there are some cases where there may be a problem. If you notice any of the following, speak to your pediatrician:

  • The baby’s eyes don’t move together or appear crossed
  • One or both eyes appear cloudy or have a white pupil
  • The baby’s eyes don’t focus on objects or seem to wander

In most cases, these issues can be corrected with treatment, but it’s important to address them early on to prevent any long-term vision problems.


As you watch your baby grow and develop, keep in mind that their eyes are growing and changing at the same time. Understanding how a baby’s eyes develop and what to expect can help you spot any potential issues early on and seek the necessary treatment.

Remember, if you have any concerns about your baby’s eyesight, don’t hesitate to speak to your pediatrician. They can help answer any questions you may have and provide guidance about what to do next.

Frequently Asked Questions

  • Q: How much should a baby’s eyes grow in the first year?
  • A: A baby’s eyes should grow to about 75% of their adult size by the time they’re one year old.
  • Q: When should a baby be able to see as well as an adult?
  • A: By nine months old, most babies can see as well as an adult.
  • Q: What should I do if I’m concerned about my baby’s eyesight?
  • A: Speak to your pediatrician if you notice any issues with your baby’s eyes, such as crossed eyes or a cloudy pupil.
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By administrator

I am a child development specialist with a strong passion for helping parents navigate the exciting and sometimes challenging journey of raising a child. Through my website, I aim to provide parents with practical advice and reliable information on topics such as infant sleep, feeding, cognitive and physical development, and much more. As a mother of two young children myself, I understand the joys and struggles of parenting and am committed to supporting other parents on their journey.

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