Baby Zombies Default Mob: Confirmed.
Reporter Excellex here to say that Baby Zombies are now a defaults mob in Minecraft! Yes, those little viscous guys can spawn at night and from zombie spawners, and they can pack a punch! I recently was making a farm from a zombie spawner in singleplayer, and one of them spawned from it. The following picture is one wearing chainmail in mcmmo that I ran into, it wasn’t fun. Keep a lookout for em’ or they will attack you when you least expect it!