Our baby sleeps for 2 months on this mattress, and sleeping in all positions is not a problem. They reinforced pretty hard on the infant side and on the sides, up the babies for when. Even on his stomach with the sick in the mattress, the little one still breathing, which is very comforting to know! The cover is made hammer handy you can separate up and down and possibly wash separately. The zipper is good quality. The reference does not warp in lingerie and is extremely easy to pull back on the mattress. I would recommend this product.
