These items are made from either 220 gsm bamboo or 93%polyester/ 7 % spandex blend Also known as milksilk. Each listing will specify which it is. Both run true to size. Milksilk fabric is soft and stretchy, but slightly thicker than bamboo. It is still hypoallergenic, and more stain resistant than bamboo. These styles run true to sizing in regular non bamboo clothing. Dresses have snaps underneath up to 18 months, bubbles have snaps to 3T, overalls have snaps to 2T. TAT on these will be about 4 weeks.