Hi Victoria, thank you for your inquiry, the Britax Maxi Rider is based on age and height, there is height markers that you use to determine when it is suitable to change from harness to seatbelt mode. We hope this helps. 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.
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