My 4 year old daughter hates having underwear stuffed up her ass. She seems really happy with them. They're not very tight (I picked them up according to the recommended size), but that doesn't bother them. The waistband has real elastic in the fabric, which is different from most underwear. Again she doesn't mind. I have two prints (melody and sweet girl) and some of the loops are already being untied. You might be left behind I think. They also go well with dresses if you care about modesty. It wasn't a criteria here, but I know some people are looking for it. In addition, exactly the same briefs can be found cheaper and in more colors on AliExpress. Shipping options are also wider if you're not in the US.
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