Ma Marie Built To Grow Crib. Sweet dreams start here with our Built to Grow Crib. It's ultra functional and can be transformed from crib, to toddler bed to a full size bed with our conversion kit and safety pieces, purchased separately. This crib features openings to make installing bumper pads easier, an optional storage drawer for baby's necessities, and three adjustable mattress height positions. Can also be used as headboard only with metal bed frame. Assembly required.