AbstractEnergy intake in breast fed infants is uncertain. The doubly labelled water method was used to measure, simultaneously and non-invasively, energy expenditure, energy intake, milk volume intake, energy deposition, and the energy content of breast milk in 12 "free living" breast fed babies at 5 and 11 weeks of age. The validity ofthis new approach was assessed in a parallel study in 12 formula fed infants. The babies who were exclusively breast fed expended 1-28 and 1-68 MJ/day at five and 11 weeks and …
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