The arm positions of Baby Zombie Villagers are to high causing their arms to clip in their heads.

Steps to reproduce:

1. Spawn a Baby Zombie Villager with no AI

2. Observe the arms of the Baby Zombie Villager

3. Switch to spectater mode, fly into the Baby Zombie Villagers head and observe the arms

Observed Behavior:

The arms clip in the head

Expected Behavior:
The arms are below the head