Head Support and Infant body insert

Hi Amy, Thank you for your enquiry. No it is not advised or recommended to add the head support and Deluxe Infant Body Support at a later date for the Diono Olympia. 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 you and help answer any further questions you may have regarding seat installation and recommendation for you and your child. We hope this has helped with your query.