title: Factors related to duration of postpartum amenorrhoea among USA women with prolonged lactation.
abstract: Duration of postpartum amenorrhoea (PPA) was compared among women who breast-fed for > or = 6 months (breast-feeding group) or < or = 3 months (formula-feeding group) and was found to be significantly shorter among the latter. Associations between maternal factors and duration of PPA were examined. Within the formula-feeding group, the only variable associated with duration of PPA was duration of breast-feeding. Among breast-feeding mothers who resumed menstruation after 3 months postpartum, duration of PPA was positively associated with parity and negatively associated with maternal body mass index (BMI) at 3 months postpartum. Among breast-feeding mothers who resumed menstruation after 6 months, duration of PPA was positively associated with parity, pregnancy weight gain, number of night feeds and milk volume at 6 months, and negatively associated with maternal age and BMI at 6 months postpartum. These results indicate that maternal anthropometric status is related to duration of PPA, even in a relatively well-nourished population of lactating women.
authors.affiliation: Department of Nutrition, University of California, Davis.
authors.forename: M J
authors.initials: MJ
authors.lastname: Heinig
authors.forename: L A
authors.initials: LA
authors.lastname: Nommsen-Rivers
authors.forename: J M
authors.initials: JM
authors.lastname: Peerson
authors.forename: K G
authors.initials: KG
authors.lastname: Dewey
mesh_terms: D000328:Adult; D000568:Amenorrhea; D015992:Body Mass Index; D001942:Breast Feeding; D005260:Female; D006801:Humans; D007229:Infant Welfare; D007231:Infant, Newborn; D007774:Lactation; D008423:Maternal Age; D014481:United States; D014930:Women