These Tweety Bird bummies are so sweet or as Tweety Bird says..... "Tweeeeet"! This duo is stretchy and comfortable. Just add a cute shirt and it will definitely be a beautiful fit for a cute baby girl! The material is made to fit the baby/ Toddler so the material is stretchy and soft. If you are concerned with snug fit, order a size up.95% Cotton 5% Spandex