title: Twinning and the changing pattern of breast-feeding: a possible relationship in a small rural population.
mesh_terms: D000328:Adult; D001942:Breast Feeding; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011388:Prolactin / Q000378:metabolism; D011792:Quebec; D012424:Rural Population; D014427:Twins
chemical_list: D011388:Prolactin