Breast-feeding and mother's education.
D000328:Adult; D001942:Breast Feeding; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology; D036861:Delivery, Obstetric / Q000379:methods; D004522:Educational Status; D005260:Female; D006801:Humans; D007774:Lactation / Q000187:drug effects; D008423:Maternal Age; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology
D003278:Contraceptives, Oral, Hormonal; D011374:Progesterone