My first grader is learning about the wide variety of nouns in our grammatical repertoire: common nouns, pronouns, proper nouns... and today, plural nouns. With that as your backdrop...
Bear: There are special ways to make certain plural nouns.
Me: Oh? Such as...?
Bear: Well, if you have a baby and you want to make babies, you take away the y and add ies.
Me [what I really said]: That's right!
Me [what I wanted to say]: If you already have a baby and you want to make more babies, you should know that grammar has nothing to do with it.