how big does a toddler need to be to get out of car seat
1 Generally, kids need to use a booster until they are at least 4 feet 9 inches tall and weigh between 80 and 100 pounds. 2  For most kids, they will be between ages 8 to 12 years old.3  Talk with everyone who drives your kids so they understand that booster seat use is a must when your child is in their vehicles.hildren seated in a booster seat in the back seat of the car are 45% less likely to be injured in a crash than children using a seat belt alone.