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Background: Adolescent pregnancy is frequent in Chile, and their infants could present an increased risk of inadequate breast feeding and weight gain. Objectives: To assess the early weight gain in infants born to Chilean adolescent mothers and their association with breast feeding, risk of jaundice and hospitalization. Subjects and methods: Forty full-term and adequate for gestational age newborns (SG; M/F: 27/13), born to healthy adolescent mothers (less than < 19 y at delivery) (SG) from low socioeconomic groups, were recruited in a public hospital in Santiago, Chile. They were paired with 36 born to healthy primiparous adult mothers (control group CG; M/F:19/17); those born with low birth weight or congenital malformations were excluded. They were assessed at well baby clinics in primary care centers for weight, length, (median age: 8 and 30 d.; breast feeding, jaundice and hospitalization were registered). Results: No significant differences were found in weight gain at 8th day of age (SG: -1,5 g/d (-107 to +36); CG -5,7 g/d (-59 to +39) (NS), both lower than the weight increments of WHO standards (14-21 g/d); birth weight recovery was found in SG: 52%% and CG: 44% (NS). Neither a difference was found at 30 days (SG: 31g/d (-1.7 to +79), CG: 28 g/d (-3 to63); (NS), comparable to WHO standards (males: 34 g/d; females: 29 g/d). However, the sub-group of infants born to adolescent mothers 15-16 y. presented a greater weight gain than those to adolescents mothers 16-17 y. (38 g/d (9 to 79 vs 25 g/d ,-1,7 to + 57) than the CG (p<0.02). Formula breast feeding was provided to 8/40 in SG and 10/36 in CG (NS). No differences in jaundice was found at the 3rd day, but an increased rate was observed at the 8th day (SG 13/40 vs CG2/36) (OR 8.2; CI: 1.7-39; p=0.003), without an increased risk of hospitalization. Conclusions: Infants born to Chilean adolescent mothers have a comparable weight gain to infants born to adult mothers, with a comparable time of birth weight recovery. Those born to mothers 15-16 years of age had a greater weight gain than those born to mothers 17-18 years or adult mothers. Jaundice to the 8o day was greater in the SG with no increased rate of hospitalization.

GANANCIA INICIAL DE PESO DEL RECIÉN NACIDO DE TÉRMINO HIJO DE MADRE ADOLESCENTE