Will a prenuptial agreement control custody of my child?

I am from Chicago and my soon to be husband is from Morocco. He is here in the United States on a work visa. I am pregnant with our first child and we will be married before the baby is born. My fiancé wants me to sign a prenup that says no matter what happens with our marriage, I will grant him equal custody of our child. I am concerned about doing this and he is able to take the child to Morocco once his name is on the birth certificate, and possibly even register the child as a Moroccan citizen? Can child custody be included in a prenup and is there any way to include language preventing my future husband from taking our child out of the country without my permission, whether we are married or not?