What is the upper size/weight restriction please?

Hi Claire, thank you for your enquiry, the Safe and Sound Hi Liner is a great option until your child reaches the upper shoulder markers, or until he reaches 148cm and can sit comfortably in your vehicle. You are always welcome to visit your local store and one of our trained techs could assess your child in the seat. 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.