I got the 4T for my 23 month, 25lb son who is tall and lanky. He usually wears 18 month size pants. They perfectly on him. The legs were snug enough to prevent anything from getting out, but not too tight. I would definitely recommend going at least a size or two bigger than what the age says. The diaper was well made and I like the little bit of padding in there that a lot of the other reusable swim diapers lack, but that does cause them to take longer to dry. They also only have the three buttons on one side so they aren't adjustable once your kid grows.
Thank you for taking the time to give us your feedback. We are so glad to hear that you are enjoying the diaper. I apologize for confusion regarding the sizing! The sizing for regular clothing and the sizing for swim diapers can be different as our swim diapers are made to help prevent leakage. While we try to develop our clothing to fit the ‘average’ child in the age group, all children grow and carry weight differently. We would be happy to assist you with finding the best size for your child using our sizing chart and their measurements. We sincerely appreciate all feedback from our customers and will ensure that we pass along your suggestions regarding the snap options to our Product Development team. We will continue to work hard to provide high quality products and we hope that you will continue to choose green sprouts® and i play.® for baby-friendly products.