What I've discovered so far is that pregnancies last only about a day. When the infant is born, he automatically gets a cradle. It stays at the spot where the mother gave birth. Mothers can feed (nurse) and cuddle babies. I got a notice a couple of days later that the baby was about to grow up. However, the camera didn't pan to it, so I didn't get to see it. My queen was hunting bears at the time. The baby went straight to a child. The player does not control the child, but you can send him shopping and have access to his inventory. Otherwise, it's just the normal interactions. I'll post more information as I get it. Right now, it's night time and the queen has gone to bed. I don't know what the child will do.