Similac Pro-Advance and Pro-Sensitive infant formulas are the first and only leading formulas with 2'-FL Human Milk Oligosaccharide (HMO)* (*Not from human milk)2'FL HMO is an immune nourishing prebiotic previously only found** in breast milk (**At significant levels) and 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)Similac is the first and only leading infant formula brand with no artificial growth hormones† (†no significant difference has been shown between milk derived from rbST-treated and non-rbST-treated cows)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