A reusable diaper may include at least one fluid-absorbing insert or layer coupled to one or more inner portions of the diaper for use in absorbing fluids. The fluid-absorbing insert may be adjustable for accommodating use by a male and/or a female. In an exemplary embodiment, the fluid-absorbing insert has a first end portion and a second end portion opposite the first end portion. The first end portion is fastened to the diaper at a first location adjacent the forward waist portion. The second end portion is fastened to the diaper at a second location adjacent the rearward waist portion. The fluid-absorbing insert includes a portion between the first and second end portions that is adjustable relative to the crotch portion between the first and second locations for selectively changing an overlapped region of the at least one fluid-absorbing insert to accommodate use by a male and/or a female.