A diaper has a diaper body, two straps and at least one strap hook-and-loop fastener. The diaper has an absorbent portion, a front covering portion connected with the absorbent portion, at least one body hook-and-loop fastener mounted on the front covering portion, and a rear covering portion connected with the absorbent portion. The straps are elongated and are respectively connected with two sides of the rear covering portion. The at least one body hook-and-loop fastener is selectively attached to the outer side of one of the straps. The at least one strap hook-and-loop fastener is mounted on one of the inner side and the outer side of one of the straps, and the at least one strap hook-and-loop fastener is selectively attached to the other strap. Therefore, the diaper can be suitable for different users of different waist sizes.
