In sims, no. But for the sims2 if you want a naturally born child you have to, you could call the adoption center though, and they're also cheat codes you can you use to make them pregnant with a...
Not in the original. In the first, one of the couple asks the other if they want a baby. Saying yes causes a baby and cradle to magically appear. In Sims 2 and 3 however, there is an action called...