Pope cautions couples on using NFP
...he cautioned that couples should use this method, too, in a way that is "truthful to their love." The use of natural family planning can also be subject to abuse, he said, if couples avoid having children simply in order to make their own lives easier or more affluent.

The Holy Father recommended that pastors should show "understanding" toward the many couples who have difficulty fulfilling the natural plan of marriage. But he emphasized that such "understanding" should not mean ignoring the laws of nature and the teachings of the Church...
~Catholic World News