Infant Microbiota and Probiotic Intake Study

Inclusion Criteria: * Healthy, non-smoking women and their infants * Who are pregnant in their third trimester OR have delivered by C-section or vaginal birth within the past 7 days * Patients who live within a 20-mile radius from University of California Davis Medical Center (UCDMC) or a 20-mile radius from UC Davis Campus in Davis, California. * Plan to exclusively breastfeed their infants for at least 3 months * Infants: 0-7 days old, delivered by C-section or vaginal delivery, born \>37 weeks gestation, without medical complications that would preclude breastfeeding or alter gut microbiota Exclusion Criteria: * Infants born with medical complications such as: respiratory distress syndrome, birth defects, and infection * Infants who have taken antibiotics for more than 72 hours of life * Infants who have consume formula feedings after day 7 of life * Mothers and their infants who are not discharged from the hospital by day 4 of life due to complications * Plan to administer probiotics to infants or use of probiotics other than the study supplement by infants anytime throughout the study duration * Women who have had any breast surgery or injury within the past 5 years that would reduce the chance of successful exclusive breastfeeding * Mothers who have a chronic metabolic disease or obesity