my son is approx 15 lbs and I bought the medium size. it fits a bit tightly. wish i had ordered a bigger size. 3 stars

This shipped super-fast.
The diapers are nice - more economical than disposables. I'd advise to order up if your child's weight is in the upper half the limit on the size chart - they're a bit snug.
Also - these do not contain liquid (urine), but do hold solid waste well.
They're cute enough that you don't need a separate swim suit bottom. 4 stars

Great price and product. We spend a lot of time in the water and these are very economical and work well. I thought that I would use both disposable and the swim diaper depending on the situation. Since I put the swim diapers on I have not used the disposable swim diapers. I didn't realize that you got two diapers in the pack, so they are even a better deal than I expected!! 5 stars

These are great diapers and much more cost effective than disposable. They don't hold urine (we just put a towel down in the stroller or car, that's the only negative!), but then again I'm not so sure the disposable ones did either once they were wet. My daughters got a rash within 10 minutes of wearing disposable diapers...these diapers dried like a bathing suit and they were able to wear them for 3+ hours at the beach. We hated having to constantly change the disposable diapers, and we were spending a ton of money on the disposable ones. They look cute under bathing suits and are hardly noticeable. We ordered the purple ones- one has polka dots and the other is plain- very cute! The 2 pack is a bonus if you do have an accident and need to change. The size chart is pretty accurate as well- I went up to XL for my 27 lb daughter and ordered L for my 22 lb. daughter and they fit just right. Love them and would highly recommend them! 4 stars

very happy with the swim diapers they really work great over a swimmie diaper for extra added protection 5 stars