Final answer:
Children in New Hampshire must be restrained in a child passenger restraint system until they are 8 years old or 57 inches tall, with specific requirements based on age and weight.
Step-by-step explanation:
In New Hampshire, children must be restrained in a child passenger restraint system until they are 8 years old or 57 inches tall, whichever comes first.
This requirement applies to children ages 0 to 2.5 who weigh less than 30 pounds, children age 2.5 to 6 who weigh less than 55 pounds, and children ages 6 to 13 who are under 57 inches tall.
At age 13, children are no longer required to be in a child passenger restraint system, but they must wear a seat belt.