The contraceptive effect of breastfeeding.
D000568:Amenorrhea / Q000209:etiology*; D001942:Breast Feeding; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D007986:Luteinizing Hormone / Q000378:metabolism; D008598:Menstruation; D049590:Postpartum Period; D011247:Pregnancy; D011388:Prolactin / Q000378:metabolism; D013997:Time Factors
D011388:Prolactin; D007986:Luteinizing Hormone