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).
Age regulations for car seats vary by car seat type; children should ride in rear-facing seats or front-facing seats between the ages of 1 and 3 and may remain in car seats or transition to booster seats between the ages of 4 and 7.