Breastfeeding and fertility control.
D000022:Abortion, Spontaneous; D001942:Breast Feeding; D003267:Contraception; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D007231:Infant, Newborn; D007774:Lactation; D008297:Male; D010298:Parity; D011247:Pregnancy