Tank: (Seeing a baby on TV) Oh, mommy, look a baby!
Me: That’s right.
Tank: I want one!
Me: You have your brother.
Tank: No, I want a new little one like that.
Me: Sorry, bud, no more babies.
Tank: Can I have one for my birthday?
Me: How about a fish?
I can see this is how kids negotiate getting puppies and ponies.