Best booster for 4.5 year old?

Hi Kate, thank you for your enquiry, the Evenflo Big Amp Booster is suitable from 4+ years or 13.6kgs, there is stock in our Christchurch stores, however, we would recommend popping in and trying it in your car with your child to make sure it would be a suitable fit. We hope this helps. ?For further information on this or any of our other products available, 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.