Size:23.2 Ounce (Pack of 1) Similac Pro-Advance with 2Õ-FL human milk oligosaccharide provides immune support by encouraging immune cells to release protective proteins in amounts more like the breastfed baby. ItÕs also the first leading infant formula with no artificial growth hormones. Parents reported a reduction in fussiness, gassiness, crying, and spit-up after just 1 day of feeding, and the improvement was maintained while feeding the formula. Our exclusive blend of DHA, Lutein, and Vitamin E is important for helping support babyÕs brain and eye development. You can trust Similac, the #1 infant formula brand chosen by moms and the #1 brand fed in hospitals. Not from human milk. No significant difference has been shown between milk derived from rbST-treated and non-rbST-treated cows. After switching to Similac Pro-Advance. Total US infant formula, all outlets as of 3/31/2018, Nielsen data.