Minecraft /summon baby zombies?

I was wondering how you can summon baby zombies. You seem to be able to summon every entity in minecraft except them. What is the exact command (including data tags etc.) that is needed to summon a baby villager.

You can summon baby zombies and baby zombie villagers.
Baby Zombies: /summon Zombie ~ ~ ~ {IsBaby:1}
Baby Zombie Villager: /summon Zombie ~ ~ ~ {IsBaby:1, IsVillager:1}