Does the crib mattress fit?

In choosing a crib mattress, fit is essential. Test-fit your baby crib mattress into the crib and check to see how much clearance there is between the edge of the mattress and the side of the crib. If you can fit two fingers comfortably between the mattress and the side of the crib then the mattress is too small, which means your baby could suffocate if he falls between the mattress and the side of the crib.