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Malnutrition in children is very difficult to overcome and some cases of malnutrition have caused death in children. Malnutrition prevalence in children under five in Bali is still high (13%). Nutrition condition in children is affected by several factors, one of which is exclusive breastfeeding. The purpose of this study was to find out the relationship between exclusive breastfeeding and nutritional status of children aged 7 - 18 months in Puskesmas Pupuan I, Bali. This study used cross sectional analytic design, and the variables studied were exclusive breastfeeding status and nutritional status, with a total sample of 140 mothers, selected by simple random sampling technique. Data of exclusive breastfeeding were acquired directly using a questionnaire and the nutrition status was measured using secondary data from Kartu Menuju Sehat (KMS) which then was converted into anthropometry table. Data were analyzed using bivariate analysis with chi square test (α = 0,05) and multivariate analysis with logistic regression test, with confounding variables included in the analysis. The study results showed that 50% of 718 month-old children received exclusive breast feeding, 17,9% were malnutritioned, and the 82,1% of children had good nutrition. The multivariate analysis showed, exclusive breastfeeding had the strongest influence on the nutritional status of children aged 7-18 months (p = 0.030; OR = 3,005), compared with calories intake (p = 0,035; OR = 2,967) and protein intake (p =0,035; OR = 2,896). It is recommended that mother should be encouraged to give exclusive breastfeeding, to prevent malnutrition in children.