The Church has compassion for couples suffering from infertility and wants to be of real help to them. At the same time, some “reproductive technologies” are not morally legitimate ways to solve those problems.
The bishops of the United States have produced a question-and-answer booklet call “Life-giving Love in an Age of Technology” which addresses many of these issues. You can view it here.
For more information, read the pamplet Life Matters: Reproductive Technology