My Grandson is 2.5yrs old and weighs 31lbs, he has chunky thighs, the swim diaper we had before was snug and worked great! We live on a private ski lake so he's in his swim diaper for long periods of time, the original swim diaper did it's job keeping an accident in however The toilet sucked it up, so I bought this one to replace it. We purchased a size 3, 4 just in case. The 3 doesn't fit him at all. The 4 fit him snug like the other diaper did, however after just 35min in this his thighs were red and raw. My little niece who is thin as a rail wore the size 3 she normally fits a 18-24 mo. and she too had red raw areas on the front inside of her thighs. The front padding is just to much in my opinion. The back is thin. They are made very durable, colors & patterns are great. Just way to padded in the front.
I've called the manufacturer and waiting for a response.
Expensive, and not worth it!