UNcommon wisdumb trivia question of the day

From time to time, we read to the baby. You know, childrens books, Lowrider magazine, books-on-tape, etc. And naturally, I have come to wonder if... my baby has a better chance of hearing me (Kevin) talk if I speak directly into: a) Karla's open mouth, b) Karla's belly button, or c) other ??