Excellent cotton lined potty training underwear from Montessori. My child is 21 months old, he is slim. The 18-month-old fits him snugly β not too tight around the hips, but again with no gaps. I combined them with Gerber sweatpants in size 18 months. They are almost identical. Note that this doesn't stop leaks - we still have smaller puddles than thin underwear will allow. You can combine them with waterproof cases.
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