what age can child stop using booster seat in Ma
â¢ Infants and children must ride in a federally approved child passenger. restraint until they are at least 5 years old and weigh more than 40 pounds. â¢ Children older than 5 and more than 40 pounds must ride in a booster seat. until the child is 8 years old or is taller than 4 feet 9 inches.â¢ Anyone over the age of 8 must be protected by a safety belt. Beginning July 10, 2008 a child passenger restraint is required by law for children 5-7 years of age or until they reach 4â9â in height in the state of Massachusetts. This means that for children who have grown out of their forward facing child safety seat, the next step is the booster seat.