In honor of September being National Baby Safety Month, a pair of large retailers are giving parents a chance to unload their children's old car seats and save some money on new ones. Target has announced the return of its car seat trade-in program in which customers can trade in old car seats from Sept. 10-23 at Target stores and receive a coupon for 20 percent off the purchase of a new car seat, including booster seats, car seat bases and travel systems.