Having a baby on mobile Sims

From what the in-game actions claim, you can apparently have a child. Once you work up to two sims getting married and build the Children's Store, it SAYS you can have a kid. I was given the active quest to specifically have a baby, and all it says you have to do is get two sims married, then buy a crop and the game does the rest. So I married multiple sims, and bought a crib, and put it into my house. It's supposed to pop up a little bubble where it says "add sim." I've gotten it to do this once, but the household had no married sims? Then in the home with married sims, I can't get the add sim bubble to appear at all? Now in the original house, I've also gotten THESE sims married. Neither household will allow me to add a sim with the crib for some reason. It might even pop up a thought bubble with an x on my active sim. There is zero pregnancy in this game, but you can add a baby and it will apparently be delivered to you. I'm not sure if this is some kind of bug, or if I'm missing something