 In this study, the safety and effectiveness of 12-week probiotic supplementation on the incidence and duration of infectious episodes in infants aged 6 to 12 months will be determined. The subjects will receive follow-on formula containing 1 million CFUg Lactobacillus rhamnosus HN001 trademarked DR20, 1 million CFUg Bifidobacterium animalis subsp. lactis HN019 trademarked DR10, or placebo formula for at least three feeds per day for 12 weeks. 