The color of our eyes, hair and skin comes from a yellowish-brown pigment called melanin. A newborn baby will continue to produce more melanin after they are born, which causes the “baby” blue eyes to gradually change to their permanent color. The permanent eye color is dependent on the amount of pigment the iris produces. The amount of pigment generated is dependent on inherited genes.
Irises containing a large amount of melanin appear black or brown. Less melanin produces green, gray, or light brown eyes. Blue eyes contain very small amounts of melanin. People with albinism have no melanin in their irises causing the iris to appear pink in color due to the reflection from the blood vessels in the back of the eye.
If you are interested in finding out what color of eyes your child will have, check out this link to an eye color calculator: http://genetics.thetech.org/online-exhibits/what-color-eyes-will-your-children-have.