Infant colic is a common condition of unknown pathogenesis that brings frustration to families seeking for effective management. Accumulating evidence suggests that some single strains of lactobacilli may play a positive dietary role in attenuation of colic in exclusively breastfed infants. The objective of this study was to evaluate a mixture of two strains in decreasing infant cry and fuss in this population. Infants aged 4⁻12 weeks received 19070-2 and 12246 in a daily dose of 250 × 10⁶ CFU, 3.33 mg of fructooligosaccharide, and 200 IU of vitamin D₃ (84 infants, probiotic group) or just vitamin D₃ (84 infants, control group) for 28 days. Cry and fuss time were measured with validated Baby's Day Diary on days 0 and 28. At baseline, mean (SD) duration of cry and fuss time was comparable in the probiotic and control groups: 305 (81) vs. 315 (90) min., respectively ( 0.450). On day 28, mean cry and fuss time became statistically different: 142 (89) vs. 199 (72), respectively ( 0.05). Mean change in cry and fuss time from day 0 through day 28 was -163 (99) minutes in the probiotic and -116 (94) minutes in the control group ( 0.019). Our findings confirm that lactobacilli decrease cry and fuss time and provide a dietary support in exclusively breastfed infants with colic.