Florida law requires parents and guardians to ensure their children sit in age and sizeappropriate car or booster seats. In New York, children should remain in a booster seat until at least age 8.Children in booster seats should remain in the back seat. The law clearly states: Children 5 years old or younger must be secured in a federally approved child restraint system. Booster Seats: Use a belt positioning booster seat when your child's weight or height is above the forward-facing limit for the car seat. Children under eight years of age, weighing under 100 pounds, and shorter than 4'9" need to use a booster chair in the backseat. Florida law states that children ages 4 through 5 must be in a separate carrier, integrated child seat, or booster seat. At least 5 years or 40 pounds to use a booster seat. Booster seats until the child is six years of age. Oregon requires children to ride in a harnessed car seat or booster seat until they are eight or until they reach four feet nine inches tall.