Smart Bottoms' Organic, One Size, All-in-One diaper fits most babies 10-35 lbs. This uniquely designed diaper offers superior absorbency without additional bulk. The attached insert can be folded to customize where your child needs the most absorbency. Inner: 100% Organic Cotton Outer: 100% PUL Prep diaper before first use by washing 6-8 times. Test the absorbency by pouring water onto the dry diaper; it should absorb instantly. If it does not, wash a couple more times and try again. The number of washes required to properly prep the diaper depends on the type of washer and detergent, as well as the hardness of the water. Wash and dry warm. Do not use bleach or fabric softener. Lined with 100% Certified Organic Cotton. Offering 10 super absorbent layers. All-in-One design makes diaper changes quick and easy. Patent-pending design allows for quick dry time. Most machines will dry in one cycle on warm. Manufactured in the USA from domestic and foreign materials.