A diaper has a diaper body (10), two straps (20) and at least one strap hook-and-loop fastener (21). The diaper body (10) has an absorbent portion (11), a front covering portion (13) connected with the absorbent portion (11), at least one body hook-and-loop fastener (14) mounted on the front covering portion (13), and a rear covering portion (15) connected with the absorbent portion (11). The straps (20) are elongated and are respectively connected with two sides of the rear covering portion (15). The body hook-and-loop fastener (14) is selectively attached to the straps (20). The strap hook-and-loop fastener (21) is mounted on one of the straps (20), and the strap hook-and-loop fastener (21) is selectively attached to the other strap (20). Therefore, the diaper can be suitable for different users of different waist sizes.
