Eye color is hereditary. The wikipedia article says it's more complicated than dominant and recessive, but what my biology-teaching brother told me is that if you carry the gene for blue eyes (and have brown eyes yourself), you can pass on the blue gene (trying hard not to make a pun here) to your child. If the other parent also carries the blue gene, then your child could have blue eyes.
answered 15 Jul '10, 21:41
Babies have a tendency to start with blue eyes that will change color later. So depending on the age of your little girl, that could be the answer.
However I had a situation like yours. My son has brown eyes. My husband and I have green eyes. My daughter, mom and MIL have blue eyes. My dad and FIL also have green eyes. So eventually I mentioned the aberration to my in-laws. I found out that my FIL grew up with brown eyes then one day received a really nasty concussion. He said he saw double for 3 weeks after the injury. When his vision cleared he had green eyes. Any way, we figured that my son's brown eyes came from his paternal grandfather.
answered 14 Jul '10, 14:31