The application of Billings for fertility regulation method during the period of breastfeeding.
D001208:Asia; D001942:Breast Feeding; D002681:China; D003906:Developing Countries; D005191:Family Characteristics; D005193:Family Planning Services; D005195:Family Relations; D005202:Asia, Eastern; D006262:Health; D007227:Infant Nutritional Physiological Phenomena; D009035:Mothers; D009747:Nutritional Physiological Phenomena; D010061:Ovulation Detection; D010290:Parents; D011446:Prospective Studies; D012106:Research
Asia; Breast Feeding; Cervical Mucus Method; China; Clinical Research; Developing Countries; Eastern Asia; Family And Household; Family Characteristics; Family Planning; Family Planning, Behavioral Methods; Family Relationships; Health; Infant Nutrition; Mothers; Natural Family Planning; Nutrition; Parents; Prospective Studies; Research Methodology; Research Report; Studies