LOVE this swim diaper, I don't know why we didn't do it sooner!  We use cloth diapers (fuzzi bunz) and overall are happy with those.  I used Huggies swimmie diapers for the pool, figured it was more sanitary in case of an accident, but always seems to give the boys (now ages 2 and 6 months) a bad rash, probably the chemicals mixed with chlorine.  So finally bought these last month and am so happy!  So worth every penny and they will save us in the long run, too.  We haven't had a big pooh in them, but I have no doubt they'd work just as well as any disposable.  I bought four pairs so we'd have an extra for each kiddo while at the pool just incase.  I wash them on warm with the boys' clothes and then line dry, they do great!  They do run pretty small I'd say, I was surprised.  We got medium and they fit both a kids well (17lbs and about 20lbs).  Our two year old is VERY small for his age and he'll probably be in a large soon.  I'd highly recommend them to any one, it's a great alternative to the cost of disposables, plus it's easier on a kiddo's bum, AND it's more green.  Can't go wrong.