Group 1 - The article emphasizes the importance of maternal milk oligosaccharides (HMO) in enhancing infant immunity during the critical immune protection window after birth [1][2] - It highlights that infants experience a "window of vulnerability" around six months of age when their immune systems are still developing and maternal antibodies are declining [1][2] - The article discusses the recent approval by the National Health Commission of China for 2'-fucosyllactose (2'-FL) and lacto-N-neotetraose (LNnT) as new food nutrition fortifiers, indicating a growing market for HMO products in China [2] Group 2 - Clinical data shows that HMO-containing formulas can increase secretory immunoglobulin A (sIgA) levels in infants by promoting the growth of beneficial bacteria and reducing harmful bacteria [2] - The article advises parents to follow the "three looks" principle when choosing HMO products: look at research, formulation, and reputation to ensure quality and effectiveness [2]