Econobum Diaper Size The Econobum kit cloth diaper wraps are one-size-fits-all. These diapers will work on children weighing between 8 and 35 pounds. The unique snaps on the front of the diaper are arranged in three rows and three columns to allow the snaps to be positioned for any baby size. Prefold & Cloth Diaper Description The Econobum kit prefold cloth diapers fall into the category of Prefold Cloth Diaper & Diaper Cover. A cloth diaper is folded to fit inside of a waterproof diaper cover. The snaps hold the diaper in place. The cover is 100% polyester and the prefolds are 100% unbleached cotton.