I found that "they" do NOT need to go to the hut.
Spoiler....




Put "them" together. When they start to walk to the hut grab one and put them together again. Keep doing this until She has a baby in her arms. It saves time doing this and you can keep track of which two you are trying to mate LOL. Keep watching her as it sometimes takes a second or two for the baby to show up.

I don't get the baby to show up right away, but I have seen the number jump up before they get in the "love shack".

The baby doesn't appear right away; once there is a conception, the mother needs to nurse the baby for two years (Isola time).

You will see the mother walk around with the baby in her arms.

and 2 years, in 2X time is about 1hr so, 5 mins for each month, i think