Abstract: The safety bumper is useable with a child's bed. The safety bumper is receivable by and placeable on a mattress, and comprises a fitted mattress engaging portion and a bumper portion. The mattress engaging portion includes a ring-like underside surface engaging portion for engaging the underside surface of the mattress. The mattress engaging portion defines an opening. An endless side surface engaging portion is provided for engaging each of the first and second opposed side surfaces, and the first and second opposed end surfaces of the mattress. An elastic member is capable of extending chordally along the underside surface of the mattress between a pair of opposed points of the endless side surface engaging portion. The bumper portion comprises an endless ring capable of being disposed adjacent to the first and second opposed side surfaces, and the first and second end surfaces of the mattress.