Once your child outgrows the limits set by the manufacturer on the forward-facing car seat, it’s time to move to a belt-positioning booster seat.
Booster seats should always be used with a lap/shoulder belt and should never be used with only a lap belt.
The booster ensures that the shoulder portion of the seat belt lays flat across the center of the chest and away from the face, and that the lap belt fits snugly over the top of the thighs.
Most booster seats are designed for children who weigh between 40 and 120 pounds.
Remember: don’t use a booster seat before your child outgrows a forward-facing seat with a harness.