How did our son end up with *hazel* eyes?

Well, my mother has brown eyes (her parents were brown/blue), my father has blue eyes (his parents are green/blue), and I have hazel eyes.

Suburban Plankton has blue eyes. His parent’s are blue/blue. I don’t know his grandparents colors.

Our son has dark brown. Definitely not hazel. I don’t understand it.

Well, my mother has brown eyes (her parents were brown/blue), my father has blue eyes (his parents are green/blue), and I have hazel eyes.

Suburban Plankton has blue eyes. His parent’s are blue/blue. I don’t know his grandparents colors.

Our son has dark brown. Definitely not hazel. I don’t understand it.

The quick and easy answer based on your kid’s age, and the pictures you linked to, is that you actually have no idea what his eye color is yet. He’s still so young that the pigments in his eye haven’t really started to be produced at normal levels yet. You’ll have a much better idea what his adult eye color might be when he’s about a year old, four months is way too early to tell how they’ll develop.

Even after the one-year mark his eyes might continue to change. I had bright blue eyes until I hit puberty. Over the next few years they faded a bit to a blue-grey color. Then bits of green started to creep in. Now, at age 32 (damn birthdays keep sneaking up on me) I have mostly blue-grey eyes with green flecks, a color combination that makes them a bit chameleon-like. Depending on what I wear they can look very green to almost colorless grey. If you compared a picture of my eyes at age 2 to one taken right now at age 32 you wouldn’t think they were the same person’s eyes.