Youcat commented through CCC – Question n. 419.

YOUCAT Question n. 419 - How many children should a Christian married couple have?

(Youcat answer) A Christian married couple has as many children as God gives them and as they can take responsibility for.

A deepening through CCC

(CCC 2373) Sacred Scripture and the Church's traditional practice see in large families a sign of God's blessing and the parents' generosity (Cf. GS 50 § 2). 

Reflecting and meditating 

(Youcat comment) All children whom God sends are a grace and a great blessing. That does not mean that a Christian couple is not supposed to consider how many children they can raise responsibly, given the health of each spouse and their economic or social situation. When a child comes “nevertheless”, that child should be welcomed with joy and willingness and accepted with great love. By trusting in God, many Christian couples find the courage to have a large family.

(CCC Comment)

(CCC 2378) A child is not something owed to one, but is a gift. The "supreme gift of marriage" is a human person. A child may not be considered a piece of property, an idea to which an alleged "right to a child" would lead. In this area, only the child possesses genuine rights: the right "to be the fruit of the specific act of the conjugal love of his parents," and "the right to be respected as a person from the moment of his conception"  (CDF, Donum vitae II, 8).

(The next question is: May a Christian married couple regulate the number of children they have?)