In my game the town babies have never died that I know of. They do seem to be neglected however, whenever I have visited the homes where they live. Their bars are always yellow, orange or red and the adults in the home are busy doing their own tasks and when I send my Sim to care for the baby, then the other adults head for the baby too.
I'm "sensitive" to my Sims babies and I just have to do something to help them. So, thanks to Pam who showed me how to build/buy in the town, my babies and tots have cribs, potty chairs, high chairs and toys in every location except for the career buildings that I can not see into. I have noticed that since taking that action, the town Sims seem to bring their babies out with them more often. I also have visited all of the homes that have babies and tots and I have equipped all of their homes with the items as well.
My Sims babies and tots wish to thank you again Pam.