Hi Kate, Thank you for your enquiry. Unfortunately the Recaro Young sport is not designed or suitable for use as a booster seat. If you are searching for a booster option in the Recaro range, we would recommend looking at the Recaro Milano Booster Seat. To view this product online, follow the link: https://www.babyonthemove.co.nz/car-seat/shop-by-standard/ECE-Standard/RecaroMilanoBlack. Alternatively, If you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder where you can find contact details for your nearest Baby On The Move Store. Here, one of our expert Car Restraint Technicians can assist in helping you find the right car seat for you and your child. We hope this has helped with your query.