Multiple babies

@Murry2211 If the game decides to play stubborn and will only give you a single baby instead of the twins you are hoping for, there is still another way for you to get the twins you want by using the cheat called cas.fulleditmode. You'd have to wait till your baby is a toddler because unfortunately the game doesn't really fully recognize infants as "Sims" until they reach toddler age. This is not a mod so it will work on PC, Mac, or console.

As soon as your baby ages-up to being a toddler, open a cheat window and then type testingcheats on and press Enter, then type cas.fulleditmode and press enter again. Exit the cheat window. Then do the following steps:

- Have one of your adults click on a dresser or mirror (like you would for planning outfits) and select Change Sim.
- With the toddler selected, click the Add a Sim button in the lower left of the screen and Play with Genetics from the pop-up menu.
- In the Create His/Her: block, choose Sibling & the game will generate a brother or sister (your choice) for the selected Sim.
- Click the Randomize Twin button, and congratulations you now have twins! :D

The game will prompt you to choose a name and trait for your new toddler as well as any outfits, hairstyles, etc., you choose. You should not have to edit their appearances any beyond that, they should be identical twins for appearance.

I tested this method with the Bheeda family from the City Living EP. I created a twin sister for their daughter Cassandra and then aged them up to Teens just to verify they would still have the same appearance as they grew older. It might not have been 100% perfect but it was pretty close! I could not tell them apart.

Btw- the cas.fulleditmode cheat can be used at any point in your game to change things like names, traits, appearance, etc., for any of your Sims.

Good luck, I hope this helps :D