Psychosocial: Infant colics may be more frequent with an instable psychosocial family environment. Maternal stress, anxiety, and depression are important risk factors.8 Breastfeeding: The difference between breastfeeding and bottlefeeding for colicky infants is controversial. Many studies have shown contrasting results,17 but the majority of the authors agree to attribute an important role to bottlefeeding. 9 A melatonin role was assumed too. This hormone is not secreted in infants, but only in adults, and has a hypnotic and relaxing role on the gastrointestinal smooth muscle. Its concentration shows a clear circadian rhythm, with a pick during night hours. Its presence in breast milk may be related to the lower occurrence of colics in breastfed infants compared with the bottle-fed infants.9 Recent literature shows an increasing attention toward probiotics,10 for the intestinal microbiota modulation. Some Lactobacillus reuteri strains were studied, with contrasting results in different studies; other probiotics as bifidobacteria showed in vitro anti-inflammatory properties and the ability to inhibit coliforms growth, whose presence is significant in colicky infants. Some probiotics exert a direct action on the bacterial growth, through bacteriocins production and final fermentation products.11 Bifidobacterium breve was isolated from healthy infants' feces.12 Aloisio et al13 tested in vitro ability of this strain and of other 45 bifidobacteria strains to oppose the growth of several microorganisms such as E. coli, S. enteriditis, C. difficile, K. pneumoniae, and Enterobacter cloacae. B. breve BR03, in a randomized clinical study, proved to have a beneficial effect on constipation in adults, it also seemed effective for the reduction of gas formation and for abdominal distension, and no side effects were shown during the treatment, while the beneficial effects lasted for up to 15 days after the end of the treatment.14,15 Both bifidobacteria strains showed, during an in vitro study, the ability to oppose 4 strains of E. coli; in particular, BR03 displayed an activity against E. coli O157:H7, an enterohemorrhagic strain that through Shiga toxin causes a potentially lethal infection.16