 Groening thought that it would be funny to have a baby character that did not talk and never grew up , but was scripted to show any emotions that the scene required . Maggie 's comedic <unk> include her tendency to <unk> and land on her face while attempting to walk , and a <unk> for sucking on her pacifier , the sound of which has become the equivalent of her catchphrase and was originally created by Groening during the Tracey Ullman period . In the early seasons of the show , Maggie would <unk> her pacifier over other characters ' dialogue , but this was discontinued because the producers found it too distracting . 
