Sadie's been potty trained for a couple weeks now, and has had a terrible rash most of the time. The rash is right around where the elastic band rubs on her lower back. I thought maybe her skin just wasn't used to undies rubbing on it, and it would go away, but it's only gotten worse. She says it hurts, and complains about it a lot.

I'm not sure why she's so broken out. Anyone else experience this? Is an elastic allergy a thing? I can't seem to find toddler underwear without an elastic band... any help there?