Abstract: A modular, adjustable maternity mattress designed to accommodate a pregnant woman at rest in a prone or side lying position; comprised of a sectioned base cushion and corresponding relocatable upper cushions as a head cushion, an inflatable abdominal cushion, and a leg cushion. The sectioned base cushion is shaped as a thin conventional mattress and is slightly longer than the overall length of the head, inflatable abdominal, and leg cushions joined end to end. The head and leg cushions are thick, flat, and generally squared, with wedge shaped medial ends (relative to the centrally located inflatable abdominal cushion) that slope downward and inward towards the base cushion and inflatable abdominal cushion respectively. In the preferred embodiment, the inflatable abdominal cushion is composed of a series of vertically tiered independently inflatable cells, the overall lengths of which increase as they ascend, and each cell having an inflator inlet and deflator outlet.