The Fairly OddParents

'The Fairly OddParents' is a Nickelodeon animated series created by Butch Hartman and co-produced by Frederator Studios and (from Season 6 onwards) Billionfold Studios. The series follows the misadventures of Timmy Turner, a ten-year-old boy whose miserable life at home and school results in him being assigned two fairy godparents, Cosmo and Wanda, who are there to grant his wishes and make him happy. However, there are rules that must be followed, the most important being that a godchild can't reveal the existence of his godparents or else they'll be taken away forever. Many of Timmy's wishes take a turn for the worst and need to be fixed. The cartoon started life in 1998 as a series of shorts on Oh Yeah! Cartoons until 2001, one week before the 'The Fairly OddParents' show premiered. It ran from 2001 to 2006, going on hiatus before resuming in 2008 and finally ending in 2017 with ten seasons overall.

S6E1: Fairly OddBaby
In this special, Cosmo and Wanda have a child, Poof. At the climax, he's fed a Fireball Burito. This results in his diaper to expand to an incredible size before exploding, restoring things to normal.