Natural live cultures such as B. infantis Rosell-33 for pregnant women, breastfeeding mothers, infants & children These 3 strains of natural bacteria from OptiBac Probiotics have been carefully selected for babies and children, and tested to survive stomach acidity. With Fructooligosaccharide fibres. Each sachet provides 3 billion live cultures (3 x 10^9) + 0.75g FOS fibres.