Background: The prevalence of allergies was increased in recent years in all countries in the world. Nutritional intake was one of the factors that could influence the incidence of allergies in infants. Short breastfeeding could increase the incidence of allergies in the first year of life. In addition, exclusive breastfeeding was estimated to have a preventive effect against the early development of allergic diseases. However, the research on the relationship of nutrition intake with the incidence of allergies was still limited so that this research needs to be done.Aim: To determine whether nutrient intake at the age of 0-3 months was associated with the incidence of allergies in infants and determine whether breastfeeding alone at the age of 0-3 months can reduce the incidence of allergies.Methods: Analytic observational study with prospective cohort study design since infants aged 0 to 3 months in 39 subjects who were only given breast milk, and 39 subjects were not only given breast milk. Subjects taken from four puskesmas, a hospital, and a maternity clinic in an urban area of Semarang. Data obtained from the questionnaires by subject's parents which monitored every month for 3 months.Results: 56.4% of the group of subjects who were only given breast milk, and 67.6% of the group of subjects who not only given breast milk at the age of 0-3 months experienced allergic manifestations. P value of the correlation analysis results between nutritional intake with the incidence of allergy in infants at 0.317.Conclusions: There was no significant association between nutrient intake at the age of 0-3 months with the incidence of allergies in infants.