Enfamil A.R formula is specially formulated with added rice starch for a thicker consistency to reduce reflux and spit-up by over 50%* in one week. Enfamil A.R. formula provides complete nutrition for your infant up to 12 months and is designed to reduce your baby's spit-up with a thicker formulation. Spit-up is a common side effect of your baby's developing digestive system. But a switch to Enfamil A.R. Infant Formula may make a difference. *Based on a clinical study of Enfamil A.R. infant formula before the addition of DHA, ARA and prebiotics with infants who spit up frequently (5 or more spit-ups per day), comparing frequency and volume of spit-up after feeding Enfamil A.R. to the same babies at the beginning of the study.