Cosmo and Wanda are going to have a baby! And, in typical fairy fashion, it's...
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Season 6 Episode 9: Wishy Washy/Poof's Playdate
Dad entrusts Timmy with washing and preserving his classic Stryker Z sports car!Wanda worries that Poof doesn't have interaction with other fairy babies, so Timmy turns the adult fairies into babies, so Poof can play with.