Regardless of the meaningless trait system for toddlers, teens or adults, there is a consequence for not taking care of toddlers. You can lose them so you have to constantly watch them.
It's exactly what I said. The traits exist but they have no bearing on the game play. They are so minute that you will never notice them. I've played through YA and Adult with the traits. It's as if I never installed the pack.
The Vampire Pack is not regular at all. Even the toddlers update was not regular. If you ignore the needs of your toddlers, child protective services will take them away. Both of those packs/updates have serious consequences for sims.
That's why Planned Parenthood abortion clinics in the game is a great idea! You can kill your babies before they're born! Get rid of the rugrats before they infest your sim lives. haha
The Sims is about life. If you choose not to start a family, that is fine! But when you're dead the game is over. Just like in real life. Unless you're a vampire, of course.