Atkinson is an English-language surname. The name is derived from a patronymic form of the Middle English Atkin.
These are much more conservative than state laws, in general (for instance, everyone should be in a booster seat from about age 4 to at least age 8) but remain less conservative than some of the european standards (for instance, the European Child Safety Alliance recommends that children remain in rear-facing carseats until 3 years of age).
Then, they can move to a booster seat. Ages 4 to 8: Children must remain in a booster seat in the back seat of a vehicle until they are at least 8 years old or 57 inches tall. Once they reach that age or height, they can use the regular adult seat belts.