As a mother of two kids, I've tried different formulas for both of them. My son has acid reflux and when he was a newborn, we tried different brands and types of formula. The one formula that we stuck with until my son has been on regular milk was Similac Total Comfort. This formula didn't cause the gas or constipation that Enfamil Gentle Ease did with my son. I know all babies are different and different things will work for some, but this formula was a winner for us.