Can the mattress/base height be altered?

Hi Anna, Thank you for your enquiry. The Grotime Backsaver V2 Cot is designed for use from baby to infant stage. The base/mattress cannot be adjusted, only the side panel which can be set at various heights. This cot adheres to safety standards in accordance with instructions for use as detailed in the user maunual. This clarifies the heights that the side panel must remain at during use for safe use. 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.