Nearly half a million baby strollers in the United States and Canada are being recalled because of a chocking hazard, the U.S. Consumer Product Safety Commission and Health Canada said. An embroidered logo on the canopy of the B.O.B. Trailers Inc jogging strollers can detach, posing a choking hazard to babies and young children, the agencies said in a joint statement. B.O.B., of Boise, Idaho, has received six reports of children mouthing the detached patch on the single and double strollers.