Could Dairy Be Contributing to Your Child’s Symptoms?
I’ve noticed a pattern with some new infant and toddler patients lately, with parents come in describing things like:
A constant runny nose
Ongoing congestion or “stuffiness”
Chronic cough or throat clearing
Open mouth breathing with lots of drool
Constipation that just won’t resolve
Stomach discomfort, gassiness, or bloating
Often, these symptoms have been brushed off as “normal,” especially in young children. But when we take a closer look—and sometimes simply reduce or remove dairy for a period of time—the changes can be significant. Let’s talk about why.
What’s Actually Happening in the Body?
This is the part that often gets missed.
Not all reactions to dairy are allergies. In fact, many children are experiencing something more subtle—a sensitivity or intolerance—and that can still have a real impact on how their body functions.
Here are the main ways dairy can affect the body:
1. The Immune System + Inflammation
Proteins in cow’s milk (like casein and whey) can trigger an immune response in some children. Even when it’s not a full allergy, the body may still recognize these proteins as “irritating,” leading to low-grade inflammation.
That inflammation can show up as:
Nasal congestion or runny nose
Increased mucus or thicker secretions
Skin changes like eczema
Gut irritation
In little bodies that are still developing, even mild inflammation can have noticeable effects.
2. The Gut Connection
The gut is still maturing in infants and toddlers, which means it can be more sensitive.
Dairy can:
Disrupt the balance of gut bacteria
Irritate the gut lining
Slow down how quickly food moves through the intestines
When the gut is irritated or sluggish, we can see:
Gas and bloating
Discomfort with feeds or meals
Changes in stooling patterns
3. Why Dairy Can Contribute to Constipation
This is one of the most important (and overlooked) pieces.
Research—including a study published in Pediatrics (Iacono et al., 1998)—has shown that some children with chronic constipation improve when cow’s milk is removed.
Here’s why that may happen:
Inflammation in the gut can make stool passage uncomfortable
The body may respond by slowing motility (movement of stool)
Children may begin withholding stool because it’s uncomfortable
Over time, stools become larger, harder, and more difficult to pass
And importantly—constipation doesn’t always mean not going.
It can also look like:
Daily stools that are hard or large
Straining or discomfort
Skid marks or incomplete emptying
A child who avoids going
4. Lactose vs. Protein Sensitivity
It can also help to understand that dairy issues aren’t all the same.
Lactose intolerance → difficulty digesting the sugar in milk (more common in older children)
Milk protein sensitivity → reaction to proteins like casein or whey (more common in infants and toddlers)
Protein sensitivities are more often linked to:
Constipation
Mucus/congestion
Skin symptoms
Why This Gets Missed
Many of these symptoms are considered “common”:
Runny noses
Constipation
Mild skin issues
And while they are common, they aren’t always optimal.
A few reasons this gets overlooked:
Symptoms are often mild or chronic rather than severe
Standard allergy testing may be negative
Dairy is such a regular part of children’s diets
Symptoms show up in different systems (gut, skin, respiratory), making it harder to connect
Clinical Perspective
In my work as a speech language pathologist and feeding clinician, I spend a lot of time looking at the whole child—not just one symptom.
What I’ve noticed is when a child has ongoing congestion, mouth breathing, or discomfort, it often impacts more than just their health.
It can affect:
Feeding skills and coordination
Oral motor development
Sleep quality
Regulation and overall comfort
When we reduce or remove dairy in children who are showing signs of sensitivity, I often see:
Clearer breathing (which supports better oral function)
Improved comfort during meals
More regular, easier bowel movements
A more regulated, comfortable child overall
It’s not that dairy is “bad”—it’s that some children’s bodies just aren’t handling it well right now.
And when we support the body by removing that stressor, things can shift quickly.
A Gentle Approach for Parents
If you’re wondering whether dairy could be contributing to your child’s symptoms, you might consider:
A short trial of removing all forms of dairy (2–4 weeks)
Observing changes in:
Stool patterns
Congestion
Sleep
Overall comfort
Slowly reintroducing to see if symptoms return
Consult with your pediatrician, pediatric dietician or qualified feeding therapist before making any significant changes to your child’s diet.
This May Connect Directly to Constipation
If your child is struggling with constipation, this is an important piece to consider.
Because when the gut is irritated—even slightly—it can change everything about how stool moves through the body.
In my next post, we’ll dive deeper into:
What constipation actually looks like in infants and toddlers
Why going “every few days” isn’t always normal
How to support your child’s gut in a way that feels manageable and effective
Final Thoughts
You know your child best.
If something feels off—even if it’s been labeled as “normal”—it’s okay to look deeper.
Sometimes, something as simple as adjusting dairy can make a meaningful difference in how your child feels every single day.
References
Iacono, G., et al. (1998). Chronic constipation as a symptom of cow milk allergy. Pediatrics, 102(6), e73.
Venter, C., & Meyer, R. (2010). Food hypersensitivity and the role of elimination diets. Proceedings of the Nutrition Society.
Lomer, M. C. E., et al. (2008). Lactose intolerance in clinical practice. Alimentary Pharmacology & Therapeutics.
American Academy of Pediatrics (AAP). Milk Allergy in Infants and Children.
Heine, R. G. (2013). Cow’s milk protein allergy and lactose intolerance in infants and children.