A child support system for infants or small children. The child support system includes a child containment device and at least one child support unit detachably mounted to the child containment device. The child containment device includes a frame, liner and, optionally, a raised bassinet mattress. The at least one child support unit may take the form of a bassinet, sleeper, seat, and/or a changing table. The child containment device frame can be collapsible for storage and transport. The child support unit can be configured for use in different modes, in combination with, and/or independent of the child containment device.