Black hair babies? As the offspring of a white mama and a black daddy, I have that mysterious hair in-between. After suffering under the naivete of my mother's best endeavors, I can share a legacy of dos and don'ts for you would-be-torturers.
DO NOT wash your baby's hair every day! While Caucasian scalps suffer from oily secretions that require frequent and even daily washings, all curly hair requires extra moisture. It benefits from a few days' reprieve between shampoos.
DO NOT brush your baby's hair while it is dry. I know: you've been told never to brush wet hair, but that advice is not for bi-racial hair. A wide-toothed comb will slip easily through super-conditioned lock, decreasing resistance and pain.
DO wet, condition, and comb bi-racial hair each day. It's the fastest and least painful way to get through those tangles.