An interesting picture (and the only one I've been able to find which demonstrates the whole "small children being taught to pee out the front door" idea, whether or not it's actually a truism throughout history): the January illustration in the Hennessey Hours, c. 1530-1540. (But this kid is obviously well beyond infant-aged.)
My linkspage on children's clothing has lots of examples of what children wore when they were beyond swaddling age, but none (except perhaps for Conrad Schwarz aged 1 to 3 years) show what was (or, in this case, was not) being worn underneath.
(And now I am struggling to remember which illustration actually showed a medieval training-potty ... nothing as fancy as this or this, but it was pretty clear that was the same sort of function. If I find it again, I'll send you a link. I feel almost sure that it was a 15th century illustration, and may have been somewhere in L'enfance au Moyen Âge, but can't recall where.)
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My linkspage on children's clothing has lots of examples of what children wore when they were beyond swaddling age, but none (except perhaps for Conrad Schwarz aged 1 to 3 years) show what was (or, in this case, was not) being worn underneath.
(And now I am struggling to remember which illustration actually showed a medieval training-potty ... nothing as fancy as this or this, but it was pretty clear that was the same sort of function. If I find it again, I'll send you a link. I feel almost sure that it was a 15th century illustration, and may have been somewhere in L'enfance au Moyen Âge, but can't recall where.)