 Maggie is the youngest child of Marge and Homer , and sister to Bart and Lisa . She is often seen sucking on her red pacifier and , when she walks , she trips over her clothing and falls on her face ( this running gag is used much more in earlier seasons ) . Being an infant , she cannot talk . She is a counterpart to Lisa Simpson . However , she did appear to talk in the first Tracy Ullman short . Therefore , she is the least seen and heard member of the Simpson family . 
 Maggie <a href='drop_aux' title='1'><mark>is</mark></a>the youngest child of Marge and Homer , and sister to Bart and Lisa . She is often seen sucking on her red pacifier and , when she <a href='uninflect' title='2'><mark>walks</mark></a> , she <a href='uninflect' title='3'><mark>trips</mark></a> over her clothing and <a href='uninflect' title='4'><mark>falls</mark></a> on her face ( this running gag is used much more in earlier seasons ) . Being an infant , she cannot talk . She <a href='drop_aux' title='5'><mark>is</mark></a>a counterpart to Lisa Simpson . However , she did appear to talk in the first Tracy Ullman short . Therefore , she <a href='drop_aux' title='6'><mark>is</mark></a>the least seen and heard member of the Simpson family . 
Chrissy da youngest child of Marge and Homer , and sista to Bart and Lisa . She is often seen sucking on her red pacifier and , when she walk , she trip over her clothing and fall on her face ( dis runnin gag is used much more in earlier seasons ) . Being an infant , she cannot tlk . She a counterpart to Lisa Simpson . However , she did appear to ttlkin the first Tracy Ullman short . Therefore , she the least seen and heard member of the Simpson family .