Child safety seats are designed for children of different weight, installed in the car, can effectively improve the safety of children riding seats, in the case of car collision or sudden deceleration, there are safety seats can reduce the impact on children and limit the movement of children's bodies, so as to reduce the damage to them. However, the seat belt above the car is designed in accordance with adult standards, which is not suitable for the baby. If it is used for the baby, it may be stuck on the baby's neck, which will cause greater damage to the baby in the event of an accident. When children are riding in the vehicle, because the seat belt cannot be firmly fixed on the seat above. Seat belts do not work, and child safety seats are especially important at this time.