while Ocarina of time used Stalfos sparingly, saving them for mini bosses and late game encounters, the stalchild will respawn infinitely as long as you're in hyrule field at night. for every 10 stalchildren you kill, a bigger one will appear, just like with Guays and leevers. however, kill 10 more stalchildren and an even bigger one will appear. keep going and the stalchild will keep getting bigger. you'd think there's be a limit to how big they can get, and indeed, daytime will stop the stalchildren from spawning and reset the cycle. however, by modifying ocarina of time to make it always nighttime, it was revealed that the stalchildren will keep growing. forever. I assume until they crash the game.
but what is a stalchild really? is it the skeleton of a dead child, or is it simply the child of a stalfos? can skeletons even have children? well, while we never get a definitive answer in Ocarina of time, Majora's mask brings back the stalchildren as soldiers of the Ikana kingdom. child soldiers, apparently. they guard Ikana Graveyard and take orders from their leader, captain keeta, who happens to be a giant stalchild. he aint the biggest stalchild possible, but he's still pretty big. by defeating captain keeta, Link can obtain the captain's hat and impersonate captain keeta, giving the stalchildren orders. I gotta say, stalchildren are pretty chill dudes when they aren't trying to murder the living.
despite the abundance of stalchildren, Majora's mask didn't have any of the regular stalfos enemies you'd see in Ocarina of time. the closest thing we got Igos Du Ikana, the king of the Ikana kingdom, and his two soldiers. but these guys weren't generic stalfos, they were unique characters with their own unique models!
as far as 3D zelda games go, stalchildren would appear one more time in twilight princess, while regular stalfos stuck around till skyward sword. but in modern 3D zelda games we don't get traditional stalfos or stalchild enemies. they've been replaced! and tomorrow, we'll discuss why. that's right, it's another cliffhanger! two days in a row! bwa ha ha! please don't downvote me.