I think that anything is normal. As long as he’s not constipated or his BMs aren’t bloody or too loose, most any number of poops per day is okay as long as it’s more or less consistent. My daughter mostly poops 1-2x/day. Sometimes 3x, and if she poops 3x in a day it’s not uncommon for her to not poop at all the day after, or just once. Edit: my daughter is mostly potty trained and she’s 21 months. We started slowly at 20 months just introducing it so your LO May be ready too!!
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