One of the most common problems in infants with excessive spit up or reflux is poor weight gain. Enfamil AR is designed to not only relieve reflux but combat poor weight gain issues, too. Because the formula is thicker and designed with special nutrients, it can help your baby gain the weight they should be gaining as they eat. And because your baby will be able to keep down the thick formula much easier, they’ll be absorbing all of those nutrients, not just some.