Jewish Law (halacha) permits contraception under some circumstances and prohibits under others. The decision to delay pregnancy is one that is ideally made by the couple after consultation with a rabbi who understands their personal and medical circumstances. They will likely turn to the physician for clarification of the medical issues needed to make the appropriate decision.

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Articles Contraception and Jewish Law
  Halachic Considerations in Contraception

Barrier Methods
  Combination Estrogen and Progesterone
  Fertility Awareness Method
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Cases Post cesarean contraception
  Rabbinic permission for contraception