The Stokke mattress is a good fit for a baby/young child. You obviously need a Stokke crib which is an entirely separate review. I'm a fan of Stokke products. The crib is perfect for smaller places, love the wheels, and the firm mattress complements the crib features. Yes, for a tight, perfect sheet fit, you need to get the Stokke one as well.

very comfy, just wish I was able to find more sheets for this round size

Fitted perfect