Jokes about Kids

One day four boys were playing soccer in the schoolyard. They kicked the ball up in the trees and none of the boys could get it, so they go get the teacher, who was pregnant. So she goes up the tree and one boy screams, "The teacher is going to have a boy!" Several months go by, and he teacher does have a boy. So the teacher calls the boy who shouted and asks, "How did you know I was going to have a boy?" So the boy says, "You weren't wearing any panties and I saw its mustache."