Infecting adult villagers has a chance to turn them into baby zombies

villagers go younger when infected

What I expected to happen was...:
an adult villager was infected so he should became an adult zombie villager

What actually happened was...:
he becomes a baby zombie villager

Steps to Reproduce:
i just put into a house a zombie and a villager until the villager becomes infected for some experiments and this is what i´ve seen