I've heard and seen this happening several times. I'm not talking about just a light skinned child with a bit of tone but really pale/snow white babies with blond or red hair and even blue or green eyes. A couple of those babies were conceived by blacks.
Supposedly dark skin is a very dominant trait because after all there are lots of melanin. So logically, it would make sense for the baby to have some pigment. A super white skin baby with blue or green eyes would be low in melanin.
Is it astonishing and very surprising to you whenever this happens?