SmartyPants Baby Probiotic contains pediatrician-tested probiotic strains P. pentosaceus KABP-041 and B. longum KABP-042 that are clinically studied to help soothe fussiness and reduce crying due to occasional upset tummy.* This multi-strain supplement supports baby's healthy digestive functions such as the production of beneficial gut bacteria, as well as immune health, so you know that, whether breast or formula-fed, your baby is getting some extra help in supporting their digestive and immune health.*