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Absorption of D-xylose in full term newborns adequate for gestational age: prospective study up to third month.

Studies of the D-xylose absorption capacity in newborns are scarce and the results reported are controversial. We evaluated the xylose absorption in full term newborns adequate for gestational age in the first days of life and prospectively up to the third month. D-xylosemia values of the first and second hours at birth and at 3-5 days are significantly lower than on the 15th day at one month and at three months. On the other hand, the values obtained in these last three groups showed no differences among themselves. The comparison of first hour D-xylose values between a control group and those children investigated on the 15th day at one month and at three months, revealed significant differences, but second hour values did not show statistic differences. We concluded that enterocyte absorption capacity is already completely developed at 15 days of life in full term newborns adequate for gestational age.