@Simiguy while it would be nice to have pregnant Sims get check ups and ultra sounds (and also a baby shower!), those functions are tied to a hospital/doctor office, and that would be tied to the Get to Work EP which is our only way to have a doctor or go to a hospital. I don't think the Sims team has any plans for adding to the Get to Work EP in the future, so it is unlikely that the features you mentioned would be added to the game, though it would be nice!
As for the interactions with the newborns, they already recently added to what can be done with babies when they added the Infant lifestage. This was to add a lot of missing interactions that people wanted with babies and separated the category of Babies into Newborns and Infants. The newborn lifestage is meant to be a quick lifestage where the newborn only eats and sleeps and can be comforted. You can always age the newborn up to get to the more involved Infant lifestage. 🥰
