Nearly one in four infants lacks enough healthy gut bacteria essential for training their immune systems, putting them at greater risk of developing non-communicable diseases (NCDs) such as allergies, asthma, and eczema by age 2. Bifidobacteria are among the first group of good bacteria to colonize the human gut, and their presence has been linked to positive health outcomes for the host, including protection against metabolic diseases, gastrointestinal tract infections, and inflammation. A recent study analyzed the gut microbiomes of 412 infants, selected to represent the diverse demographics of the U.S, and found a widespread deficit of Bifidobacteria in infants....