There are too many classics in this baby adventure series to name, though I am partial to the one where the babies almost die but get out of it and return to their parents who are none the wiser.
The epitome of the classic Nicktoon, Rugrats’ entire run is available to stream on CBS All Access.
In that case, my favorite is “Reptar On Ice” if only because I felt like Reptar deserved a spinoff and never got one.
That means everything from Tommy’s First Birthday well into Baby Dil’s introduction (which I think was the beginning of the end of the show’s quality, but that’s for another time).