It carries children from birth to between 40 and 80 pounds and 40 and 57 inches tall.
For Toddlers and preschoolers, This is forward-facing seat with a harness.
Combination car seats have 2 modes: forward facing with a harness, high back booster, and in some cases, backless booster.
For School-aged children.
From the time kids outgrow the weight or height limits allowed by their car seat should use a belt-positioning booster seat until the vehicle seat belt fits properly.