God Effie, don't assume things!

The youngest pregnant girl was Lina Medina who went through super early puberty, eventually got impregnated and gave birth when she was 5 years old. The baby boy came out surprisingly healthy and Lina's family raised him letting him think that Lina was his sister.

Yay! I was wrong- wait, 5? Shit. I wish I was more wrong.

She had a disease that caused an onset of early puberty and a disgusting pig of an uncle, that was in the early 1900s though wasn't it?

Well she may have gotten pregnant at 4 but then gave birth when she was 5, but I could be wrong. And yeah, I think so. There's also a picture of her during her pregnancy and it's seriously mind blowing how mature she looks.