Nowadays, most parents know that the car baby seat is a kind of seat that everyone with a car at home needs to install when the baby rides in the car, which can improve the safety of the baby. At present, there are no clear rules on how much baby seats can be used. Different countries have different regulations, some stipulate that babies under the age of 8 must use it, and some stipulate that babies under 36 kg must use it. So how old is a car baby seat? 1. In fact, the car baby seat is made according to the physical characteristics of the child. It is a special seat used to prevent the child from being unsafe when riding in the car. There are still many models of seats, the smallest seats can be used by babies aged 0-15 months, and the largest seats can be used by children aged 3-12. 2. The car child seat is mainly determined according to the weight. Generally speaking, if the child weighs more than 36 kg, it can not be used. If the child is over 8 years old, but the weight is still below 36 kg, then it needs to be used. . 3. There are many types of car baby seats, which can be used for children of different weights. When the baby rides in the car, in order to be safer, it is best to use a car baby seat. Some parents use the seat for the baby until the baby is 12 years old, this is also possible. All in all, car baby seats are determined according to their weight. Generally, children can not use car baby seats until they exceed 36 kg.