Issues in the design of breastfeeding research.
D001942:Breast Feeding; D005247:Feeding Behavior; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007224:Infant Care; D007225:Infant Food; D007226:Infant Mortality; D007231:Infant, Newborn; D012107:Research Design; D012494:Sampling Studies