How old does a child have to be to move into a boster seat?

ANSWER:

IMPORTANT fact to take into consideration is the SIZE of the child, not the age. The makers of car seats and boosters label an AGE only to give you a basic guideline. If the child is small for their age, keep them in a car seat. If the child is big for their age ,graduate them to a booster. COMMON SENSE pervails, not age!