Objectives:The objective of this study was to quantify human milk supply and intake of breastfed infants up to age 12 months. Additionally, human milk composition was quantified per energetic macronutrient and fatty acid composition in a subsample of lactating mothers.
Methods:174 Italian breastfed children were followed using test-weighing and 3-day food protocols from birth to age twelve months. From a sub-sample of thirty mothers breast milk samples were collected at child ages one (T1), two (T2), three (T3), and six (T6) months, and were analyzed for the amount of protein, digestible carbohydrates, total lipids and fatty acid composition.
Results:142 (82%) filled in at least one three-day food protocol within the first 12 months of life and complied with test-weighing of all milk feeds. The number of valid food protocols declined from 126 infants at one month to 77 at twelve months of age. Only galactose, non-protein nitrogen and protein decreased significantly from age one to age six months of lactation. Maternal BMI and age affected fatty acid levels in human milk. Median human milk intake decreased from 625ml at T1, over 724ml at T3 to 477ml/day at T6.Average energy and %energy from protein intake per day increased from 419 kcal (SD 99) and 8.4% (1.0) at T1, respectively, to 860 kcal (145) and 16.1% (2.6) at T12.
Conclusion:These data provide a reference range of nutrient intakes in breastfed infants and may provide guidance for defining optimal nutrient intakes for infants that cannot be fully breastfed.4