New Jersy State law requires all children under age 8 who weigh less than 80 pounds to be in an appropriate child restraint in the rear seat. All children between 8 years and 18 years are required to wear a safety belt at all times. Use the appropriate restraint, and use it correctly. Rear-facing seats placed in the back seat from birth to at least 20 pounds. Forward-facing seats placed in the back seat from at least age 1 and 20 pounds to until about age 4 or 40 pounds. Booster seats in the back seat from about age 4 until 8 years or 80 pounds and approximately 4′ 9″ tall.