title: Incidence of dehydration and hypernatremia in exclusively breast-fed infants.
abstract: OBJECTIVE
  To verify in exclusively breast-fed, term infants the incidence of hypernatremic dehydration and identify possible maternal and/or infant factors that interfere with successful breast-feeding.
  
  
  METHODS
  We prospectively included all healthy breast-fed neonates referred to our Neonatology Unit between October 1999 and March 2000. All neonates with a weight loss > or = 10% of birth weight had a breast-feeding test and a determination of serum sodium, urea, and base excess. Student t test and chi-square test were used for statistical analysis of the data.
  
  
  RESULTS
  Of 686 neonates, 53 (7.7%) had a weight loss > or = 10% of the birth weight, and 19 also had hypernatremia. These 53 neonates had a significantly higher incidence of caesarean delivery and lower maternal education than neonates with a weight loss < 10%.
  
  
  CONCLUSIONS
  Our prospective study demonstrates that a weight loss > or = 10% during the first days of life is frequent. Daily weight evaluation, careful breast-feeding assessment, and early routine postpartum follow-up are effective methods to prevent hypernatremic dehydration and promote breast-feeding.
authors.affiliation: Neonatology Unit of the University of Messina, 98100 Messina, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Manganaro
authors.forename: C
authors.initials: C
authors.lastname: Mamì
authors.forename: T
authors.initials: T
authors.lastname: Marrone
authors.forename: L
authors.initials: L
authors.lastname: Marseglia
authors.forename: M
authors.initials: M
authors.lastname: Gemelli
mesh_terms: D001835:Body Weight; D001942:Breast Feeding; D003681:Dehydration / Q000209:etiology*; D006801:Humans; D006955:Hypernatremia / Q000209:etiology*; D007231:Infant, Newborn; D011446:Prospective Studies