The term 'child seat' refers to a type of car seat designed for children. It is important for parents to use a child seat when transporting their children in a vehicle, as it helps to keep them safe and secure. The two crossword solutions for this term are 'KNEE' (4 letters) and 'LAP' (3 letters). KNEE refers to the area of the body between the hip and the ankle, while LAP refers to the upper part of the legs when seated. Both of these terms are used to describe the position of a child seat in a vehicle.