Minecraft 1.8.8, Minecraft 15w35b, Minecraft 15w44b, Minecraft 15w46a
Player/mob heads are offset on baby zombies and on villager baby zombies the head is still floating above mob. Heads on normal baby zombies look close to align but when zombie looks down face clips through head.
Exactly the same issue as bug #
MC-2664 except hit boxes are good. So it was marked as fixed but not visually.
Only MC version floating head was fixed is 14w33c