If your baby is struggling with digestive issues or seemingly endless fussiness, you may be wondering if it’s normal baby stuff or something more.
One possible explanation is cow’s milk protein allergy (CMPA), one of the most common food allergies in babies. I know, hearing the word “allergy” can feel overwhelming, but the good news is that CMPA is manageable, and most children outgrow it during early childhood.
In this guide, we’ll break down everything you need to know about CMPA and what to look for so you can feel more confident feeding your baby.
What is cow’s milk protein allergy?
CMPA is a type of food allergy that occurs when a baby’s immune system has a bad reaction to one or more proteins found in cow’s milk. During an immune response, the body mistakenly identifies these proteins as harmful, which triggers an allergic reaction.
How to spot CMPA
CMPA looks different from baby to baby. Symptoms often appear within the first few weeks or months of life and can range from mild to severe. Because the signs vary, it’s important to consult a pediatrician for an accurate diagnosis.
Some babies experience classic allergy symptoms, like skin reactions, and others may have digestive symptoms. Common symptoms include:
- Rash
- Hives
- Itchy eyes
- Swelling
- Wheezing
- Trouble breathing
- Mucus or blood in poop
- Vomiting
- Diarrhea
- Poor growth or difficulty gaining weight
Symptoms may appear within minutes, hours or even longer after a baby eats cow’s milk, depending on the type of immune response involved:
- IgE-mediated CMPA: Can cause symptoms within minutes to a few hours after exposure. Symptoms are typically more classic like rash, hives, swelling or vomiting.
- Non-IgE mediated CMPA: Symptoms can appear several hours after eating cow’s milk and may include blood or mucus in poop, abdominal pain or reflux.
CMPA can be tricky to identify because many of these symptoms can overlap with other common issues in babies and young children. If you have concerns, it’s important to check in with your pediatrician so they can help evaluate your baby’s symptoms and rule out other possible causes.
Diagnosing CMPA
- Medical history: Your pediatrician will review your baby’s medical history and ask questions about existing allergies in the family. They’lll ask about your baby’s symptoms, when they occur and how long they last.
- Elimination diet: One of the most common ways to diagnose CMPA is through an elimination diet. Your baby will avoid cow’s milk protein for a period of time to see if symptoms improve.
- If your baby is formula-fed, you’ll switch to extensively hydrolyzed formula or an amino-acid based formula. In these formulas, the milk proteins are broken down into smaller pieces and it may be easier for a baby with CMPA to tolerate. You may need to switch to a non-dairy formula. Your pediatrician can help you find the best fit for your baby.
- If your baby is breastfed, mom will need to remove dairy from their diet, since cow’s milk proteins can pass through breast milk.
Keeping a daily symptom log can help you and your pediatrician identify patterns and monitor whether symptoms improve during the elimination diet. It can also help determine if your baby is reacting to other foods.
Example
| Date and Time | Milk/Food Type | Symptoms and Time | Notes |
Bring your symptom tracker to your baby’s appointments. It can help your pediatrician identify trends and decide what to do next. You’ve got this.
Your baby’s been diagnosed with CMPA. Now what?
A CMPA diagnosis can feel overwhelming at first, but the good news is that it’s very manageable. The first step is to avoid cow’s milk protein while making sure your baby continues to get the nutrition they need to grow and thrive.
If your baby has started eating solid foods, you’ll want to read food labels carefully and avoid products that contain dairy. There are plenty of dairy-free alternatives for cooking and baking, including coconut, almond, cashew and pea milk. Talk with your pediatrician before introducing soy milk or soy-based foods, since some babies with CMPA may also react to soy.
Fortunately, most babies outgrow CMPA by their first birthday. Your pediatrician will let you know when it’s appropriate to gradually reintroduce cow’s milk and how to monitor for reactions.
Questions? We’ve got answers.
Can babies with CMPA have goat or sheep milk? No. Goat’s milk and sheep’s milk are not safe alternatives for babies with CMPA. Their proteins are very similar to cow’s milk proteins, and more than 90% of children allergic to cow’s milk also react to goat’s and sheep’s milk.
Is lactose-free milk OK? No. Lactose is the natural sugar (carbohydrate) in milk. Lactose-free milk still contains cow’s milk proteins — and those proteins are what trigger symptoms in babies with CMPA.
Will my baby outgrow CMPA? Most likely, yes. The majority of children outgrow cow’s milk protein allergy during early childhood, though the exact timing varies. Your healthcare provider will advise when and how to safely reintroduce cow’s milk.
