Can the bottom part become a booster seat?

Hi Michelle, Thank you for your enquiry. The Recaro Young Sport Hero is available to puchase online and in store. This can be used as a booster seat which can be used from 15 – 36kg. This seat is designed for use from 15 months to 12 years. For further information  if you click on the pink “Specifications” tab below the product image, this will give you a breakdown of dimensions for this seat. Here you can also find the “download instructions” button for further information on installation of this seat. If you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.