Abstract
We studied postnatal bone mineralization, as measured by photon absorptiometry, in 36 preterm infants (birth weight less than 1600 gm) who were fed (1) a commercial premature formula containing 117 mg calcium and 58.8 mg phosphorus per 100 kcal, (2) the same formula containing a higher concentration of phosphorus (82 mg/100 kcal), (3) the same formula with higher concentrations of calcium (140 mg/100 kcal) and phosphorus (82 mg/100 kcal), or (4) their mother's milk. Serum calcium, phosphorus, protein, albumin, bicarbonate, 25-hydroxyvitamin D, and alkaline phosphatase levels were measured at the start of the study and every 2 weeks until the infants achieved a weight of 1900 gm. Birth weights and gestational ages were similar in all four groups. The human milk group had lower serum phosphate and bone mineral values than those in the three formula groups. Bone mineral content was similar in the three formula groups. However, only the formulas of the first and third groups allowed approximation of the intrauterine bone mineralization curve. Bone mineral content in infants fed human milk was below the intrauterine rate.
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