The present study "breastfeeding and its influence on the nutritional status of Infants 0-12 months, controlled in the October 6, Belen - Iquitos District Health Center. March - August 2013 ", descriptive, correlational, quantitative Study with retrospective data collection (expo de facto), whose goal was to Determine the influence of breastfeeding on the nutritional status of infants 0- 12 months, controlled on October 6, the Bethlehem district health center, the Sample was 80 infants and the variables studied were; breastfeeding and Nutritional status. As a result of the socio-demographic characteristics of the mothers of the Infants; He is characterized by having an age 15 to 20 years in 26.25%, but The higher percentage was of 48.75% in the range of ages of 21 to 30 years. The degree of instruction of higher percentage with 70.00% were mothers Who have secondary studies; only the 2.5...