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Seeing Results with an Extensively Hydrolyzed Formula

It may have taken some time to pinpoint the cause of your baby’s distressing behavior. Now that cow’s milk allergy has been identified, it is understandable that you want your baby to feel better fast.

What You’ll Learn Today

  • Hydrolyzed formulas have proteins that are broken down to be easier to digest.
  • It’s common for babies to experience changes in stool color (often green) and consistency.
  • Babies with colic due to cow's milk allergy may show improvement in as fast as 24 hours.
  • Skin and digestive issues may take a few weeks to fully resolve.
  • Hydrolyzed formulas have a distinct taste and smell compared to standard formulas.
  • Always consult your pediatrician if you have concerns about your baby's adjustment.

Seeing your little one uncomfortable is tough for any parent. Whether you’re navigating fussiness, gas, or skin issues, you just want your baby to feel better. If your pediatrician has recommended switching to a hydrolyzed formula, you’re likely looking for relief and reassurance.

It’s helpful to know that you’re not alone in this journey. Many parents find themselves exactly where you are right now. Understanding the adjustment period can help you feel more in control and confident that you’re making the best choice for your baby's nutrition.

What Is Hydrolyzed Formula?

To understand how this formula helps, it helps to visualize milk protein. Imagine a string of pearls. In standard formula, the protein is the whole string. In a hydrolyzed formula, that string is broken down into tiny pieces.

In an extensively hydrolyzed formula, these protein pieces are so small that the immune systems of most babies with a cow's milk protein allergy usually don’t recognize them as an allergen. This makes the formula hypoallergenic and much easier for sensitive tummies to digest.

Hypoallergenic formulas, like Nutramigen® with Probiotic™ LGG®, are designed specifically to manage the issues associated with cow's milk allergy.

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Nutramigen® with Probiotic LGG® Hypoallergenic Infant Formula

What Happens After Starting Extensively Hydrolyzed Formula?

Once you make the switch, you might notice some physical and behavioral changes. Every baby is unique, so their response will be personal to them, but there are some common signs that parents often report.

Normal Adjustment Signs to Expect

  • Stool changes: This is the most common change parents notice. It’s completely normal for your baby's poop to turn a dark green color or become looser in consistency when using a hydrolyzed formula1. This is not usually a cause for concern and typically just a sign of the iron and protein breakdown2.
  • Taste and smell: You might notice that hydrolyzed formula has a different smell and taste compared to regular milk-based formula3. While it might seem strong to you, most babies accept it, especially if they are hungry.
  • Gas and spitting up: You may still see some gas or spit-up as your baby's digestive system settles. This often improves over time4.

How Long Does Hydrolyzed Formula Take to Work?

Parents naturally want to know when they will see those happy smiles again. The timeline can vary depending on what issues your baby was experiencing.

For colic due to cow's milk protein allergy, you might see results very quickly. In fact, Nutramigen® is clinically shown to manage colic due to cow's milk allergy in as fast as 24 hours.*

For other allergic issues, such as bloody stools or skin rashes (eczema), patience is key. It can take about 4 weeks for the allergic inflammation in the gut or on the skin to fully clear up. Even if the fussiness improves quickly, give the body time to heal completely.

When to Talk to Your Pediatrician

You know your baby best. While an adjustment period is normal, you should feel empowered to reach out to your doctor if you have questions. Consider calling your pediatrician if:

  • You do not see any improvement after a few weeks.
  • Your baby seems to be losing weight or refusing to eat.
  • You notice signs of dehydration (fewer wet diapers).
  • You have gut feelings that something else might be going on.

Your healthcare team is there to support you, so never hesitate to ask for a check-in.

Join Enfamil Family Beginnings® for More Resources

Navigating dietary changes and seeing how your little one adjusts to a hydrolyzed formula is much easier with a support system by your side. By joining Enfamil Family Beginnings®, you gain access to expert tips, savings, and resources tailored to your baby’s journey toward comfort. Whether you need help understanding why Enfamil is the #1 trusted brand or want more guidance on what to expect as your baby’s digestion settles, we’re here to support you every step of the way.

*In as early as 24 hours and 90% infants experienced relief within 48 hours when managing colic due to cow's milk allergy. Studied before the addition of DHA, ARA, or LGG.

FAQs

  • Extensively hydrolyzed formulas, like Nutramigen®, have proteins that have been broken down into very small pieces to avoid triggering an allergic response in most babies with cow's milk protein allergy.

  • Extensively hydrolyzed formulas have proteins broken down into small chains (peptides). Amino acid-based formulas (like PurAmino) have proteins broken down completely into their simplest building blocks (amino acids). Amino acid formulas are typically used for severe allergies when a baby still reacts to hydrolyzed formula5.

  • Babies usually need hypoallergenic formula if they have a diagnosed cow's milk protein allergy or severe trouble digesting intact milk proteins, resulting in issues like colic, gas, eczema, or bloody stools.

  • Improvements in fussiness and gas due to cow's milk allergy can happen in as fast as 24 hours. However, skin issues and stool consistency may take 4 weeks to normalize as the body heals.

  • Always consult your pediatrician first. Some doctors recommend a "cold turkey" switch to eliminate the allergen immediately, while others may suggest mixing the new formula with the old one gradually over a few days to help with taste acceptance. It could take up to 5 days for a baby to become used to a new formula.

References

1https://www.mayoclinic.org/symptoms/green-stool/basics/causes/sym-20050708↗

2https://health.clevelandclinic.org/the-color-of-baby-poop-and-what-it-means-infographic↗

3https://pmc.ncbi.nlm.nih.gov/articles/PMC2987582/↗

4https://www.health.state.mn.us/docs/people/wic/localagency/recall/transitions.pdf↗

5https://nutritioncare.org/wp-content/uploads/2024/12/Hypoallergenic-Formula-Practice-Tool.pdf↗

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All information on Enfamil, including but not limited to information about health, medical conditions, and nutrition, is intended for your general knowledge and is not a substitute for a healthcare professional's medical identification, advice, or management for specific medical conditions. You should seek medical care and consult your doctor or pediatrician for any specific health or nutrition issues. Never disregard professional medical advice or delay seeking medical treatment, care, or help because of information you have read on Enfamil.

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