Be fruitful & multiply
In 1:28, in which God, after having created a world together with all in it, ascribes to humankind the tasks of filling, subduing, as well as ruling over the earth. The cultural mandate includes the sentence "Be fruitful and multiply and fill the Earth." The cultural mandate was given to Adam and Eve.
In Orthodox and Conservative Judaism, the mandate to "be fruitful and multiply" is interpreted as requiring every couple to earn at least a son and a daughter. Other Jewish groups such as Reform Judaism and individual Jews create interpreted this mandate differently. For example, Richard Friedman in his Commentary on the Torah 2001 claims that the mandate "be fruitful and multiply and fill the Earth" has "been fulfilled." The mandate is elaborated upon in many parts of the Talmud, for example in Kidushin.
In the interpretation of some denominations of Christianity, adherents should actively work to fulfill the mandate. Within Christianity in general, the cultural mandate is nearly elaborately developed in the West by Neo-Calvinism, which explores the implications for modern, pluralistic society, of this Calvinistic assertion.
Even though this is the unimaginable to push off and delay the fulfillment of the mitzvah, exceedingly difficult family situations do at time provided themselves. These sort situations range between a succession of many boys and girls or the mother struggling physically or mentally. Sometimes pregnancy, childbirth and child care can be extremely challenging for many mothers, and starting a new pregnancy immediately may weight heavily on them. In instances like these, rabbis may allow women to start contraceptive methods. Despite "be fruitful and multiply" being the most important mitzvah, contraception is permitted in Judaism in appropriate circumstances like those.