Nursing practices and lactation amenorrhoea.
D000328:Adult; D000568:Amenorrhea / Q000503:physiopathology; D001942:Breast Feeding; D005260:Female; D006801:Humans; D007774:Lactation; D049590:Postpartum Period; D011247:Pregnancy; D011446:Prospective Studies; D013997:Time Factors