Can I use only 5 pieces to make the pen slightly smaller?

Hi Sadie, Thank you for your enquiry. Yes, the Kiddy Cots Link 70 Playpen can be adjusted to create 3 different shapes: square: 77cm x 77cm x 61cm high, rectangle: 77cm 149cm x 61cm high, hexagon: 148cm at all points x 61cm high. 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.