For parents who prefer a conventional style mattress for their babies, we are pleased to offer an organic cotton/wool inner spring mattress. The dimensions of the crib mattress is 28” x 52” x 6” and fits a standard-size crib. We are also offering a natural rubber with organic cotton and wool crib mattress. For those who prefer a crib mattress without inner springs, this is the perfect choice. The dimensions of the crib mattress is 28” x 52” x 6” and also fits a standard-size crib.