Enfamil Gentlease is an infant formula designed to reduce fussiness, gas, crying, and spit-up in babies who struggle to digest standard milk-based formulas. It uses partially broken-down milk proteins and a reduced amount of lactose to be easier on developing digestive systems. The formula is intended for otherwise healthy infants from birth through 12 months, not for babies with a diagnosed cow’s milk protein allergy.
How Gentlease Differs From Standard Formula
Standard infant formulas contain intact milk proteins that a baby’s immature gut has to break down on its own. Gentlease takes a shortcut: its milk proteins are partially hydrolyzed, meaning they’ve already been broken into smaller pieces before your baby drinks them. This gives the digestive system less work to do, which can reduce the gas and discomfort that come with processing whole proteins.
The protein blend uses a 60:40 ratio of whey to casein, which mirrors the protein balance found in breast milk. Both protein sources come from cow’s milk but have been enzymatically split into smaller fragments. The result is a formula that’s gentler than standard options while still providing the same core nutrition.
Lactose content is the other major difference. Breast milk and standard formulas get most of their carbohydrate calories from lactose. Gentlease reduces lactose to roughly 20% of the carbohydrate content, replacing the rest with corn syrup solids that are simpler for young guts to process. This isn’t the same as being lactose-free. It still contains some lactose, but the reduced amount means less fermentation in the intestines, which means less gas.
What Symptoms It’s Designed to Help
Gentlease targets the everyday digestive discomfort that’s common in newborns and young infants: excessive gas, fussiness during or after feedings, prolonged crying episodes, and frequent spit-up. These symptoms are extremely common and usually don’t signal a serious problem. They happen because a baby’s digestive tract is still maturing, and some infants simply have a harder time breaking down the proteins and sugars in standard formula.
The manufacturer states that Gentlease is formulated to ease these symptoms within 24 hours. That claim comes from a clinical study comparing infants who switched to Gentlease against the same infants when they had been on a routine formula. Individual results vary, but many parents notice a meaningful change in fussiness and gas within the first day or two of switching.
What It Won’t Treat
Gentlease is a partially hydrolyzed formula, and that distinction matters. “Partially” means the proteins are broken into smaller pieces but not into their smallest possible form. For babies with a confirmed cow’s milk protein allergy, this level of breakdown isn’t enough. Allergic reactions happen when the immune system reacts to protein fragments, and the pieces in Gentlease are still large enough to trigger a response.
If your baby has been diagnosed with a cow’s milk allergy, a pediatrician will typically recommend an extensively hydrolyzed or amino acid-based formula instead. Gentlease is also not suitable for infants with galactosemia, a rare metabolic condition that prevents the body from processing galactose, a sugar that’s part of lactose.
The formula contains soy in the form of whey protein concentrate solids, so it’s also not appropriate for babies with soy sensitivities.
Nutritional Profile
Gentlease provides 20 calories per ounce when mixed according to standard instructions, which is the same caloric density as most infant formulas. It’s designed to be nutritionally complete, meaning it can serve as a baby’s sole source of nutrition for the first 12 months when solid foods aren’t yet providing significant calories.
The formula includes DHA and ARA, two long-chain fatty acids that play a role in brain development, eye development, and immune function. DHA is an omega-3 fatty acid, and ARA is an omega-6. Both are naturally present in breast milk. Experts recommend 70 to 100 milligrams of DHA daily for infants up to 24 months, with at least an equal amount of ARA. Enfamil specifically highlights these additions as part of its NeuroPro line, which is the current branding for Gentlease.
Preparation and Storage
Gentlease comes in powder, ready-to-use liquid, and concentrated liquid forms. The powder version is the most common and requires mixing with water. Always add the water first, then the powder, to ensure the correct concentration. Using too much or too little powder changes the calorie density and nutrient balance, which can cause digestive issues or inadequate nutrition.
Once prepared, refrigerate any formula your baby doesn’t finish and use it within 24 hours. After that window, discard it. Bottles that have been partially consumed during a feeding should be thrown away within one hour, since bacteria from the baby’s mouth multiply quickly in the warm, nutrient-rich liquid.
Switching From Another Formula
Most pediatricians say you can switch to Gentlease without a gradual transition. Going cold turkey from one formula to another is generally fine for healthy infants, though some parents prefer to mix the old and new formulas over a few days to ease the change. Either approach works.
Expect some minor changes in stool color, consistency, or frequency during the first few days. This is normal as your baby’s gut adjusts to the different protein and carbohydrate makeup. If fussiness or gas worsens significantly or you notice signs of an allergic reaction like hives, vomiting, or blood in the stool, that’s a signal to talk with your pediatrician about whether a different formula category is needed.