Similac Advance is a top Similac Baby Formula and is an excellent choice if you plan to formula feed or if you choose to supplement breast feeding. The America Academy of Pediatrics recommends an iron-fortified formula as the only acceptable alternative to breast milk during the first year. No other Similac Formula has a higher level of special nutrients to help support baby's developing immune system. This Advance Formula from Similac provides 50% more calcium absorption than other formulas including those by Enfamil. The improved powder of the Similac Baby Formula has fewer bubbles to make it easier on baby. Advance Formula from Similac will help develop the immune system and keep baby happy in the process.