Soy Formula May Stunt the Intestinal Growth in Your Baby Concerns regarding the safety of soy formula were raised after two studies revealed that the amounts of soy isoflavone genistein, a chemical found in commercial soy formulas, might inhibit the intestinal growth in babies. There is a great deal of merit surrounding this concern, particularly because nearly 25 percent of formula-fed babies in the United States consume soy formula.Commercial soy formulas contain anywhere from 32 to 45 milligrams of genistein. These concentration levels exceed the amount found to affect menstrual cycles in women. Since formula is the only...