Some ingredient statements on infant formula labels include ingredients in addition to nutrients and familiar components such as milk. Why are those ingredients added?

Ready-to-feed and concentrated liquid formulas often contain ingredients such as lecithin, carrageenan, and mono- and diglycerides added to ensure that the formula doesn't separate during shelf-life.

Source: FDA/CFSAN Office of Nutritional Products, Labeling and Dietary Supplements July 2002