What’s Really in Your Baby’s Formula? A Feeding Therapist Explains
If you’ve ever read a formula label and thought, “Wait… what even is that ingredient?” — you’re not alone.
Between “corn syrup solids,” “hydrolyzed whey,” and “casein,” formula ingredients can sound more like a chemistry class than baby food. But each one has a purpose — and understanding them helps you make an informed choice for your little one’s tummy and overall health.
Let’s decode what’s actually inside that can:
Lactose
The natural sugar found in breast milk. Lactose fuels your baby’s growing brain and supports healthy gut bacteria (the microbiome). It’s the preferred carb source for most babies — unless they have lactose sensitivity or digestive challenges.
Found in: Bobbie Gentle, Enfamil NeuroPro, Similac 360 Total Care.
Corn Syrup Solids
Let’s clear this up first — this is not high-fructose corn syrup.
Corn syrup solids are a glucose-based carbohydrate often used in “gentle” or “sensitive” formulas to replace some or all of the lactose. For babies who get gassy, have mucousy poops, or seem uncomfortable after feeds, this swap can make digestion easier.
Found in: Enfamil Gentlease, Similac Sensitive, Nutramigen.
Nonfat Milk
Cow’s milk with the fat removed — leaving behind a protein- and calcium-rich base for many formulas. It helps mimic the protein structure of human milk, though it’s usually combined with added fats (like palm or sunflower oil) to balance energy needs.
Found in: Enfamil NeuroPro, Similac Advance.
Partially Hydrolyzed Whey Protein
A fancy way of saying “pre-digested milk proteins.”
These proteins are broken down into smaller pieces, which can be easier on sensitive tummies — think of it as giving your baby’s digestive system a head start. However, it’s important to know these formulas are not allergy-safe for babies with a diagnosed milk protein allergy.
Found in: Gentlease, Bobbie Gentle, Similac Total Comfort.
Casein Hydrolysate
This one goes a step further — proteins are extensively broken down so the immune system doesn’t recognize them as cow’s milk proteins. These are used for babies with true cow’s milk protein allergy (CMPA).
Found in: Nutramigen, Alimentum.
Amino Acids (Free-Form)
The simplest form of protein — already fully broken down into individual building blocks. These are used in elemental or amino acid-based formulas for babies who can’t tolerate any milk or soy proteins.
Found in: Neocate, EleCare.
So… How Do You Choose the Right Formula?
Every baby is unique. Some thrive on standard formulas; others need something gentler or fully broken down.
If your baby has:
Frequent spit-up or reflux
Mucousy or frothy stools
Eczema or visible discomfort after feeds
…it might be worth discussing a formula switch with your pediatrician or feeding therapist. Sometimes, the ingredients tell you exactly why a baby’s gut is struggling.
Final Thought
Formulas are designed to meet babies’ nutritional needs — but the best formula is the one your baby tolerates and grows well on. Understanding the label helps you feel confident and calm in your feeding choices. You’re doing great, and your baby’s body will tell you what’s working.
Written by: Dr. Marisa Milavetz
Contact us today to learn more and schedule an appointment to address your baby’s concerns!
