Birth control

contraception, prevention of pregnancy (by using condoms, birth control pills, etc.)

Birth control, sometimes synonymous with contraception, is a regimen of one or more actions, devices, or medications followed in order to deliberately prevent or reduce the likelihood of pregnancy or childbirth. Contraception may refer specifically to mechanisms which are intended to reduce the likelihood of the fertilisation of an ovum by a spermatozoon.
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Diaphragms are dome-shaped barrier methods of contraception that block sperm from entering the uterus. [more]Birth control - Community and Resources

Noun
1. limiting the number of children born
(synonym) birth prevention, family planning
(hypernym) planning
(hyponym) coitus interruptus, withdrawal method, pulling out, onanism

Synonyms and related words:
aridity, barrenness, contraception, dearth, dry womb, dryness, family planning, famine, impotence, ineffectualness, infecundity, infertility, planned parenthood, rhythm method, sterileness, sterility, the pill, unfertileness, unfruitfulness, unproductiveness, vasectomy, withered loins