These romper shorts are super stretchy, comfortable and hip. The waist is a yoga top band that does not dig in. The romper style looks good on both girls and boys, perfect for lots of movement and great for diapers.Small fits 6 months to 2 years, medium fits 2 years to 5 years. These shorts last a long time, the waist can be roll up and down to make them smaller and larger. The fabric is 95% cotton and 5% spandex fabric which allows a 4-way stretch, it's lightweight and stretchy with a super soft cotton-like hand. The patterns are crisp, bright colors that wash well, all pants are pre-washed. Shorts are handmade in Canada and the fabric is made in the USA.