Voir Adventures of Sonic the Hedgehog, Season 1, Vol. 1 - Episode 28

Robotnik invents a Brain Evolution Achievement Negatizer, or B.E.A.N., in order to make all of Mobius stupid. But instead of turning Sonic and Tails into dummies, the BEAN device turns them into three year old babies! And Sonic is a pretty smart baby. When Robotnik tries to reverse the device to make himself smarter, he is turned into a baby. Finally, the Robotnik and his Badniks are caught, diapered, powdered and rocked to sleep by Sonic and Tails.