you're authentic, the longer a toddler keeps to be rear dealing with, the extra effective. The regulations in the U. S. cary from state to state, yet maximum states say a million year AND 20 pounds. maximum others say you need to use the seat in accordance to the producer's training, and all seats offered right here have a million year AND 20 pounds a minimum of for forward dealing with. it rather is strongly recommended to maintain toddler rear dealing with till he or she hits the barriers of the seat, which will desire to be a competent convertible seat, no longer an toddler seat, it rather is often outgrown by applying 6 months. A rear dealing with seat is outgrown whilst- there is under a million" of perplexing shell over the pinnacle OR the burden shrink is reached. different seats have different weight limits so verify the handbook. you're authentic, your sister is faulty and he or she is uncomplicated with she's incorrect it rather is why she gave you the protecting answer.