A convertible reusable diaper is provided, comprised of an outer cover portion, a liner portion, and a detachable absorption portion. The outer cover portion may generally include barrier panels attached at both the front and rear regions of the outer cover portion to form interior pockets. A plurality of fastenable tabs attached to hole-openings at the barrier panels affixes the liner portion or the detachable absorption portion in place. The hole-openings allow the passage of the fastenable tabs through the barrier panels. Both the liner portion and the detachable absorption portion include fastener members inter-engaged with the corresponding fastener members located at the fastenable tabs to allow the liner portion or the detachable absorption portion to be removably affixed to the outer cover portion. Numerous options for affixing the insert portion and the detachable absorption portion allow conversion to different diaper designs.