American Dad

[lil_mike]

Although diapers don't feature heavily in American Dad, I have noticed in a number of episodes I've seen recently there appears to be a strong infantillist theme regarding Steve. The entire plot of the episode I have just watched was that Stan thought Steve was getting too old to play with toys, but Steve didn't want to get rid of any of them, saying at one point something like "...but you're never too old to play with toys". I can't think of other specific examples right now, but it seems to me that a significant part of Steve's character is that he behaves a lot younger than he is.

[IncontinentGM24]

I think there's a reference in maybe even the pilot episode where they go into a horror movie which handed out diapers

[good kid]

ABDL's, We hide among you, we look just like, Think just like...But we wear diapers because we are strange like that...Beware!

[drynot]

There is another horror related episode where Francine talks a bit about wetting her pants by being frightened.

[barnburner]

Dont forget about the episode where Roger and Steve are hiding from Klaus in Rogers attic and are are seen wearing nothing but diapers

[barnburner]

And in another episode where Roger mentions the diaper he wears when eating Indian food

[NateSean]

Family Guy and American Dad are filled with ab/dl references.