In the Catholic Church, marriage is considered a sacrament and a sacred covenant between a man and a woman. The primary purpose of marriage, according to Catholic teaching, is the mutual love and support of the spouses and the procreation and education of children. The Church teaches that married couples are called to be open to the gift of new life and to participate in God's creative plan by being open to having children.
The Catechism of the Catholic Church (CCC) states in paragraph 1652:
"By its very nature, the institution of marriage and married love is ordered to the procreation and education of the offspring and it is in them that it finds its crowning glory."
Therefore, intentionally deciding not to have children in a marriage may be seen as contrary to the Catholic Church's teaching on marriage and its openness to procreation. This is because it goes against the natural purpose and meaning of marriage as understood by the Church.
However, it's essential to note that the Catholic Church acknowledges that some married couples may face situations where they are unable to have children due to medical or other reasons. The Church's teaching emphasizes that the openness to life is about the will and attitude of the couple rather than merely the ability to conceive. Even in situations where a couple cannot have children, they are still called to live their marriage in love and to be open to God's plan for their relationship.
It's also important to understand that Catholic teaching on this matter is subject to pastoral sensitivity and understanding. Each individual's circumstances are unique, and the Church encourages couples to seek spiritual guidance and discernment from their parish priests or spiritual advisors if they have concerns or questions about marriage and family planning. Pastoral support and compassion are offered to those facing various challenges in their marriage journey.