The Incredible Lightness of Being a Baby is the eighteenth episode of Season 31.
Synopsis
When Maggie reunites with Baby Hudson (from "Playdate with Destiny"), Marge won't let her play with her new baby crush because of his annoying mother, leading Maggie into a depressive spiral. Meanwhile, Cletus comes across quite a bit of money and becomes a helium tycoon, so Mr. Burns wants Homer to help him obtain it.