The Sim will be able to get different moodlets when talking about their baby with another Sims, and some interactions may have various moodlets, for example if you are talking about going back to work or Promote Breastfeeding. Once the baby is born the menu will be fully functional for your Sim.
The step is the same if your Sim has just given birth. If your Sim already has a baby you must click on another Sim on the interaction called Talk About Babies in the Better Babies menu. This mod is not compatible with any other mod that use Baby Bassinet interactions I hope that with this mod you will have much more fun with babies and toddlers. I find the features in game related to parents and children really poor and that's what motivated me to make mods to improve little Sims in the game. Hi Here is the First release of my mod for Better babies and toddlers.