100%Cotton. | Machine wash cold with like colors, dry low heat | Dry clean is also an option, and will lengthen the use of your dress. | Breatheale100% Cotton apericots baby clothes are made from 100% cotton, making our items soft, comfy, and breathable for your active baby or toddler | The items are Asia sizes which are smaller than US,notice actual size information before purchasing.(0-3 Month length:21.7-24 inch weight:7.9-12.6lb;3-6 Month length:24-26.3 inch weight: 12.6-16.5 lb ;6-9 Month length:26.3-28.3 inch weight:16.5-20.5lb; 9-12 Month length:28.3-30.7 inch weight:20.5-24.5lb;12-18 Month length: 30.7-32.7 inch weight:24.5-27.6 lb 18-24 Month length:32.7-33.9 inch weight:27.6-30 lb)