My understanding, is that the couple must be good friends with any baby in the house at the time they begin the process of the next baby making activity (pregnancy or adoption). So they can adopt while pregnant but if they wait for the baby to be born, then they must become good friends with that baby before adopting. So adoption during pregnancy would be fine, as long as the friendship requirement was met with existing babies in the household. Then the marriage requirement comes into play for the 2nd pregnancy or 2nd adoption.