title: Additional water is not needed for healthy breast-fed babies in a hot climate.
abstract: In Lahore, Pakistan, a community-based study was conducted to investigate whether or not it was necessary to give water to breast-fed infants. From May to November 1986, 2-4-month-old, breast-fed infants (n = 26) were selected. During the study period the maximum temperature ranged between 27.4 and 40.7 degrees C and humidity varied between 24 and 77%. Each infant was followed up for 15 days. Water was not allowed from day 1 to day 8 and water was allowed ad libitum from day 8 to day 15. All infants were subjected to a DDAVP test to estimate the renal concentrating capacity on day 15. A significant gain in weight (p < 0.001) was observed between day 1 to 8 and 8 to 15. The differences in the values of haematocrit and serum sodium between day 8 and 1 and between day 15 and 8 were not significant. This indicates that the infants were not dehydrated when water was withheld. Furthermore, no significant difference was observed for urine specific gravity between day 8 and 1, but urine specific gravity increased significantly after the administration of DDAVP (p < 0.001), indicating that, if needed, the infants could concentrate urine when water was restricted. It was concluded that 2-4-month-old, breast-fed, healthy infants showed no signs of dehydration if additional water was not given during the summer season.
authors.affiliation: Department of Social and Preventive Paediatrics, King Edward Medical College, Lahore, Pakistan.
authors.forename: R N
authors.initials: RN
authors.lastname: Ashraf
authors.forename: F
authors.initials: F
authors.lastname: Jalil
authors.forename: A
authors.initials: A
authors.lastname: Aperia
authors.forename: B S
authors.initials: BS
authors.lastname: Lindblad
mesh_terms: D001835:Body Weight; D001942:Breast Feeding; D002980:Climate; D004326:Drinking; D005500:Follow-Up Studies; D006400:Hematocrit; D006801:Humans; D006813:Humidity; D007223:Infant; D012621:Seasons; D012964:Sodium / Q000097:blood; D013696:Temperature
chemical_list: D012964:Sodium