growth ( weight , length , head circumference , and skinfold thickness ) , retention of major nutrients ( nitrogen , sodium , potassium , chloride , calcium , and phosphorus ) , and chemical indices of protein adequacy ( plasma albumin and transthyretin concentrations ) and excess ( blood urea nitrogen concentration and acid-base status ; plasma amino acid concentrations ) were determined serially from the time desired intake was tolerated until discharge weight ( 2200 gm ) was reached in low birth weight infants ( birth weight 900 to 1750 gm ) fed one of three formulas , which provided protein and energy intakes , respectively , of 2.24 gm/kg/day and 115 kcal/kg/day ( group 1 ) , 3.6 gm/kg/day and 115 kcal/kg/day ( group 2 ) , and 3.5 gm/kg/day and 149 kcal/kg/day ( group 3 ) .
C1444754
length
C0262499
head circumference