III. The Love of Husband and Wife

From The Catechism of the Catholic Church

2368
A particular aspect of this responsibility concerns the regulation of procreation.
For just reasons, spouses may wish to space the births of their children. It is
their duty to make certain that their desire is not motivated by selfishness
but is in conformity with the generosity appropriate to responsible parenthood.
Moreover, they should conform their behavior to the objective criteria of
morality:

PART THREE: LIFE IN CHRIST

SECTION TWO THE TEN COMMANDMENTS
- CHAPTER TWO YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF
  - Article 6 THE SIXTH COMMANDMENT
    - III. The Love of Husband and Wife

From The Catechism of the Catholic Church – rosary.team