As previous reviewers have said, these Onesies do shrink and ordering a size or two larger is recommended. However, all Gerber Onesies shrink as they are 100% cotton. I have purchased them from our local Wal-Mart (thin cotton but still nice fabric and good for layering) and from Amazon (thicker cotton, nicer hems, better quality). The 24 mo Onesies fit my 18 month old perfectly. So what if I have to buy a size or two larger, it's not a big deal because they are soft and wash/wear very well. I also think Amazon makes returning / exchanging purchases easy so I would not be upset if I had to exchange them for a larger size.