On the blue eyes:

a) humans are born with blue eyes which later turn their permanent color. I've never seen a newborn baby which did not have blue eyes. It's generally held that a baby's permanent eye color cannot be predicted with certainty until his/her first birthday.

b) even during slavery times, there were mixed race marriages in the US. Anti-miscegenation laws were state laws, and not all states prohibited interracial marriage. Additionally, there were immigrants from countries that hadn't invented such laws.

c) in some places in the world, especially in the US South, one does see Black adults with blue or green eyes

d) in slavery times, Black women were often raped by white men, and it wouldn't be fair to the women to list this under "infidelity"

.