Similac ProSimilac Pro-Advance Step 1, Baby Formula, Our Closest Formula to Breast Milk with 2鈥-FL, Easy To Digest, 0+ Months, Ready to Feed, 24 x 59 mL-Advance Step 1 Baby Formula, 0+ Months, with 2'-FL. Immune Support Innovation: 2'-FL, Ready-to-Feed, 24x59mL