Baby rabbit head position and pivot are too far back/low

The position of the baby rabbit's head is too low and far back into its body, resulting in the head clipping into things like the front arms and the body. It looks strange when compared to an adult rabbit.

Steps to Reproduce:

1. Summon a baby rabbit

   /summon rabbit ~ ~1 ~ {Age:-25000,PersistenceRequired:1}

Screenshots/Videos:

Adult:

Baby: