[Longitudinal study of weight gain in premature infants from birth to the 6th post-term month].

The dynamics of weight gain were studied in 95 preterm adequate for gestational age infants between birth and their 6th post-term month. The infants were divided into 4 groups according to the number of weeks of gestation at birth, i.e., 33, 34, 35 and 36 weeks, respectively. To compare the results, weight gains were studied for each group of the same corrected ages up to the 64th week of post-menstrual age, corresponding to the 6th post-term month. Weight gain was small during the first 2 weeks of post-natal life but increased considerably over the subsequent weeks with an almost constant periodical increment (GRI) being maintained in all 4 groups during the first months of life. However, unit growth rate (UGR) reached its highest value during the first post-natal month and decreased a similarly in all 4 groups during the subsequent months, with values approximating to those reported for infants in developed countries.