Similac Pro-Advance helps strengthen your baby's immune system to be more like a breastfed baby than ever before. How? Similac with 2'-FL helps support baby's developing immune system by closing multiple gaps in immune function* between formula-fed and breast-fed infants. Unlike other formulas, Similac has 2'-FL HMO, a prebiotic that circulates throughout the body. Similac's biggest breakthrough in nearly a decade comes in two gentle formulas: Similac Pro-Advance and Pro-Sensitive. *As measured in blood samples in a clinical study Similac Pro-Advance and Pro-Sensitive infant formulas are the first and only formulas with 2'-FL Human Milk Oligosaccharide (HMO)*, an immune nourishing prebiotic previously only found** in breast milk (*Not from human milk **At significant levels) 2'FL HMO helps support your baby's developing immune system by closing multiple gaps in immune function* between formula-fed and breast-fed infants (*As measured in blood samples in a clinical study) All ingredients are carefully selected to meet our high standards and are Non-GMO*** (***Ingredients not genetically engineered) Closer than ever to breast milk. From Birth – 12 months our formula provides complete nutrition for your baby’s first year from the #1 brand chosen by moms* and the #1 brand fed in hospitals (*Total US infant formula all outlets as of 12/31/16, Nielsen data)