Oh, for the good old days when little children were little children...

A 2nd grader  came home from school, excitedly saying, "grandma, grandma, today in school, I learned how you make babies."  

Grandma despite her concern remained cool, and  said, "Oh, and, how do you make babies?'  The 2nd grader said "Oh it's so simple, you just change the 'y' from baby to an 'i' and then add 'es'.