The microorganisms within the gastrointestinal tract have received considerable attention in recent years as new tools and faster, less expensive genomics approaches, have allowed for associations between microbial behavior and disease (1). Colonization of our GI tract occurs at birth and remains unstable until approximately 3 years of age, a stage of life during which time major physiological systems such as the immune system also develop (2). Longitudinal tracking studies have suggested that this early period is critical in predisposing us to conditions, such as asthma (2,3).