Put the summary of the bug you're having here

What I expected to happen was the baby zombies should run the same speed as baby villagers.:
Describe what you thought should happen here

What actually happened was baby zombies were super fast just like endermen, the almost teleported to next villager and killed him, also that's also happens with the player.:
Describe what happened here

Steps to Reproduce:
1. spawn the baby villager
2. make him as baby zombie by another zombie
3. see the effect