Until 14 or 15 years I had double bed, it was strange. But I liked the mattress, so I used it for 3/4 years more. I can share some tips from This link . They have great options you can choose from list and also additional link for Amazon is also present there. Very positive reviews. Also, purchase sheets from same material and let your kid be in “happiness” fully. You will see there many answers that will appear as you will read more. Good luck with your choice. My preference is to Chezmoi, my partner likes it also.