Massachusetts State Law requires all children under 40 pounds or 5 years of age to be restrained in a child safety seat. State law then requires all children to be "properly restrained". Parents and care givers should be aware that at 5 year and 40 pounds an adult seat belt alone will not "properly restrain" a child. A child should be using a booster seat in conjunction with an adult lap and shoulder belt until they are 4'9" tall.
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