[A.A. Cunningham]

2379 The Gospel shows that physical sterility is not an absolute evil. Spouses who still suffer from infertility after exhausting legitimate medical procedures should unite themselves with the Lord's Cross, the source of all spiritual fecundity. They can give expression to their generosity by adopting abandoned children or performing demanding services for others.

[NYer]

You and I can understand and appreciate this teaching. How many Catholics have ever read the CCC? How many Catholics are even interested in following Church teaching?!