May a Christian married couple regulate the number of children they have?
Yes, a Christian married couple may and should be responsible in using the gift and privilege of transmitting life.
Sometimes social, psychological, and medical conditions are such that in the given circumstances an additional child would be a big, almost superhuman challenge for the couple. Hence there are clear criteria that the married couple must observe: Regulating births, in the first place, must not mean that the couple is avoiding conception as a matter of principle. Second, it must not mean avoiding children for selfish reasons. Third, it must not mean that external coercion is involved (if, for example, the State were to decide how many children a couple could have). Fourth, it must not mean that any and every means may be used. (YOUCAT question 420)
YouCat on regulating births
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Domine Non Sum Dignus!
Holiness is not for wimps and the cross is not negotiable, sweetheart, it's a requirement.
~ Mother Angelica
Holiness is not for wimps and the cross is not negotiable, sweetheart, it's a requirement.
~ Mother Angelica
I used the Billings Method, which worked wonderfully. When I became pregnant with Ingrid Nichole, I told the doctor that I would have her on December 22nd....... I had her that very day. 
Dear Fr. O was a friend of the two Billings.
http://www.woombinternational.org/
Dear Fr. O was a friend of the two Billings.
http://www.woombinternational.org/
Devotion to the souls in Purgatory contains in itself all the works of mercy, which supernaturalized by a spirit of faith, should merit us Heaven. de Sales