BOSTON -- The new child booster seat bill, which was signed in April, goes into effect on Thursday.

The updated Child Passenger Safety Law requires all children riding in passenger vehicles be in a federally-approved child passenger restraint that is properly fastened and secured until they are 8 years old or more than 57 inches tall.

If the child outgrown a child seat, he or she needs to use a belt positioning booster seat until reaching the required age or height.

The old law required the age to be 5 and the weight to be 40 pounds.

Starting Thursday, police officers may stop any vehicle if a child is riding with improper restraints. A driver can be fined up to $25 for each improperly restrained child.