Abstract

BOLOGNINI PEREIRA, Kallyne; BLONDET DE AZEREDO, Vilma; BARROS DA SILEIRA, Camila  and  MAGNAGO PEDRUZZI, Liliana. Composition of breast milk of lactating adolescents in function of time of lactation. Nutr. Hosp. [online]. 2013, vol.28, n.6, pp.1971-1976. ISSN 1699-5198.  https://dx.doi.org/10.3305/nh.2013.28.6.6909.

The aim of this study was to evaluate the composition of breast milk of lactating adolescents in function of lactation time. Methods: We followed 51 lactating adolescents, between the 6^th and 14^th weeks postpartum (WPP). The determination of fat, protein and lactose in milk were conducted, respectively, by the methods of Lucas, Lowry and Perry & Doan. Micronutrients were determined by atomic absorption spectrophotometry. Data was presented by the mean and standard error. ANOVA with repeated measures was used and Tukey as post test. It was accepted a significance level of 5%. Results: There was a significant reduction (P<0.05) in protein content during the postpartum weeks studied (6^th: 16.6 ± 1.1; 10^th: 13.7 ± 1.0; 14^th WPP: 12.3 ± 1.1 g/day). The lactose (6^th: 60.2 ± 1.9; 10^th: 60.4 ± 2.6; 14^th WPP: 65.1 ± 4.0 g/day) and fat (6^th: 41.6 ± 3.3; 10^th: 36.2 ± 3.4; 14^th WPP: 31.5 ± 9.0 g/day) concentration remained unaffected. The zinc concentration in the breast milk was lower than that is commonly found in literature (mean 1.16 mg/day). The copper, iron, calcium and phosphorus concentration was sufficient to meet the needs of the infants between 0 and 6 months old. Conclusion: The lactation period did not influence the concentration of micronutrients, lactose and lipids, but there is a reduction on protein of the breast milk. In spite of the reducing concentration of protein, it is sufficient to meet the needs of infants from 0 to 6 months old.

Keywords : Lactation; Adolescence; Weeks postpartum; Nutrients.

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