But the average prime time show has around 24 episodes (I have a feeling the average number of episodes in a prime time season have shortened, but aside from The Simpsons and Family Guy I have no evidence of that). Could kids be more understanding of frequent repeats, or could there just be smaller budgets for saturday mornings?
Of course it seems some kids shows might have a varried number of episodes per season, but 13 seems like the usual number for first seasons. Muppet Babies had a slightly different number of episodes for each season, but 13 was the number for the first year. I'm sure that Gummi Bears had 13-episode seasons every year. And shows that were cancled after one season had only 13 episodes (examples include Hey Vern It's Ernest, The Weird Al Show, and Santo Bugito). Though amazingly each production season of Fraggle Rock had 24 episodes (the last two seasons were broadcast as 13-episode seasons but were all produced the same year).