Complete Baby Zombie Remover

Removes Baby Zombies entirely. That's it. That's the entire mod.

Overrides ZombieEntity's setBaby method to exit immediately, preventing the zombie from becoming a baby. Unless a mod uses ZombieEntity internals to create a baby zombie anyways, this should prevent baby zombies from exiting. Do note that this includes spawn eggs and summoning with commands, and it will retroactively convert all existing baby zombies into normal zombies!

Simple Version

There is a version of this mod found here that just prevents zombies from spawning, by overriding shouldBeBaby to always return false.