What is the starting age/weight for this seat?

Hi Nina, thank you for your enquiry, the approx age is from 4-8 years however this is done with height markers, not weight or age so we would suggest if it is a booster you are interested in to pop into your local store to have your child fitted in the seat to see if it will be suitable. 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. We hope this has helped with your query.