Systems and methods for enabling bouncing motion using conversion devices in accordance with embodiments of the invention are disclosed. In one embodiment, a conversion kit comprises a plurality of support members, a motor, a crankshaft, and an attachment member, wherein the plurality of support members connects a frame of the crib to a mattress support platform of the crib, the crankshaft comprises an output shaft, and the crankshaft is powered by the motor, and the attachment member connects the output shaft of the crankshaft to the mattress support platform of the crib.