From Longman Dictionary of Contemporary Englishbaby/child/car seatbaby/child/car seata special seat that you put in a car for a baby or small child → seat
Examples from the Corpus
baby/child/car seat• When buying a baby seat check its weight, capacity and whether it has an integral harness and quick-release buckle.• However, a baby seat is safer than a carrycot for your baby.• It fits all Kangol framed child seats.• Two options you can not add, unfortunately, are a built-in child seat and fold down rear seatback.• Boots have stopped selling car seats but say they will offer further information to people who've bought the Rainbow seat.• Some baby seats can be converted into car seats for older children.• He thought about hiding it in the car seat, but Firebug was always moving the thing around.• Miguel told him, picking a spot opposite the car seat for the desk. 