Egyptian children look like they grow up quickly, so I wouldn't put any task (including bead work) past them.
My guide at the pyramids (who was driving 4 horses at once and whipping them like any good Egyptian man should) looked like he was four years old. He had his own little set of stirrups attached to the adult saddle; cute and sad at the same time
I'm really thinking of making all my own costumes (and clothes for that matter). Why can't we leave our children alone?