This mattress fits the mini-crib I ordered from Wayfair perfectly! The mattress that comes with the mini-crib is a joke and you will want to purchase a thicker mattress for your baby's comfort. This one has just the right amount of firmness and I actually use it on top of the thin one that came with the crib. I had a hard time deciding on a mattress from all the choices offered, but finally decided on this one. So glad I did!