We understand the question; there is really no truly satisfactory answer. She wants something that won’t cause gas or vomiting…ain’t no such animal. Infants’ GI tract is designed for breast milk only…it was patented millenna ago.
That said, brand doesn’t matter.
“Although manufacturers may vary somewhat in their formula recipes, the FDA requires that all formulas contain the same nutrient density.” “Source.”
For special needs. “In addition, there are infant formulas using soybean as a protein source in place of cow’s milk (mostly in the United States and Great Britain) and formulas using protein hydrolysed into its component amino acids for infants who are allergic to other proteins.” Same source.
” ...formulas are sold by many leading food and drug retailers such as Wal-Mart, Target, Kroger, Loblaws, and Walgreens. **All infant formula brands in the United States are required to adhere to the Food and Drug Administration (FDA) guidelines*.As reported by the Mayo Clinic: “... brand-name infant formulas cost more than generic brands.”