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).
Now both the AAP and the National Highway Traffic Safety Administration (NHTSA) recommend children face backward until they outgrow their seat. That means most children should remain in a rear-facing car seat until they're at least 2 or 3 years old.