After dosing the mother, D2O concentration was determined in saliva by infrared spectroscopy and mother's body composition and infants milk intake were determined (2) . Milk protein, fat and lactose were analysed to calculate energy intake. The infants' weight and length were compared with reference data (3) and Z scores were calculated. Energy intake, growth and body composition were compared between matched cohorts (Northwest and

Central Mexico, N and C) at 1 (n=147) and 3 (n=22)mo ofage. Data were analysedby Spearman coefficient, regression analysis and student's t test.

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