Potty-training update: on Valentine Day, Milo went to school in underwear. When Lucie came to pick him up, he was still wearing the same pants (i.e. no accidents). Hurray! He has been in underwear since, and doing great with the peeing. For the rest, his body has developed a trick: he only poops when he happens to wear a diaper (at nap, or first thing in the morning). It works for now.