What are the laws regarding seatbelts and children?

As of January 1, 2004 RSA 265:107-a, Child Passenger Restraints Required- states that anyone under the age of 18 must wear a seatbelt, if the person is less than 6 years old and less than 55 inches they must be secured by a child passenger restraint (car seat, etc.). Here is a link with additional information: Buckle Up New Hampshire.