Gerber Good Start GentlePro is modeled after the complete nutrition and gentleness of breastmilk. This formula offers complete nutrition for babies up to 12 months. Our GentlePro formula features a combination of ingredients for baby’s digestive and immune support. It contains easy to digest proteins which are small proteins that are gentle on tiny tummies. Probiotic B. lactis are active probiotic cultures which support your baby’s digestive healthy. 2’-FL HMO (human milk oligosaccharide) is a probiotic just like those found at significant levels in breastmilk. Studies have shown that HMOs help support digestive health and the immune systems.