Diaper Material:(1). Inner material is microfleece.outter material is plain color polyester with waterproof & breathable PUL.(2).- Outer Layer: The Outer/Cover Layer is made from New Improved Thermoplastic Polyurethane (TPU) Laminated Fabric， which is highly Water-Resistant， Breathable and Very Durable. It can be washed without any deformation and gives an ideal protection for your baby， the bed and Linens from leakage.- Inner Layer: The soft polyester fleece inner layer gently touches your baby's skin. This layer can wick moisture away from babies skin and keep bottom dry. There is a pocket opening located in the inner layer to accommodate the microfiber inserts/liners， you can stuff the insert inside the pocket for maximum absorbency. All of these advanced designs are to make your baby feel easy and comfortable. That is what all parents are happy to see.Insert: 100% microfiber，3 layers，36*14 cm.Features:- Size: For babies weighing 3 - 13 kg (6.5�C28 pounds)- Dimensions of insert: 35cm in length (13.77``) X 13.5cm in width (5.31``)- Wash temperature: under 30��C. (Less than 86 ��F)- One size design: S.M.L all in one size. (Please adjust the button according to the body size of baby)How many diapers do you need?- Newborn to 4 months -- 20~30 diapers- Infant (4 to 10 months) -- 20~25 diapers- Toddler (over 10 months) -- 15~20 diapersIt depends on how often you do laundry.