Should I try to reduce how many colds my child gets to lower their eczema risk?

The current evidence does not support this approach. The cohort studies establish an association, not a causal mechanism that can be modified by preventing respiratory infections. Handwashing and avoiding unnecessary sick-child contact have independent value for the child's own health, but there is no randomised controlled trial evidence that reducing cold frequency prevents atopic dermatitis.

What does the evidence say about preventing eczema in high-risk infants?

For infants with a strong family history of atopic disease, the best-evidenced strategies are: regular emollient use from birth to support the skin barrier, and avoidance of known contact irritants. Breastfeeding is associated with lower eczema risk in some studies. Prolonged antibiotic avoidance is also relevant — the new research found the respiratory infection link was independent of antibiotic use, but antibiotic overuse has its own associations with atopic disease through gut microbiome effects.

More colds in the first three years: what that means for eczema risk

What just happened

A pair of large prospective cohort studies, published in JAMA Dermatology in July 2026 and covered by Medical Republic this week, found that children who had the highest burden of respiratory infections in their first three years of life were 63–80% more likely to develop atopic dermatitis (eczema) by age 10 compared to children with the lowest infection burden.

The studies — the Danish COPSAC2010 cohort of 663 children and the US VDAART cohort of 707 children — tracked daily infection episodes from birth to age three, then followed clinical outcomes through to age ten. The association was dose-dependent: each additional infection episode raised eczema risk by approximately 3%, not a threshold effect where crossing a certain number triggered risk.

This is not a “we’ve found the cause of eczema” announcement. The researchers are careful about that. But it is a finding that warrants attention — two independent cohorts on opposite sides of the world, prospectively collected data, and a consistent dose-dependent signal. That’s the kind of evidence that moves from “interesting” to “needs explaining.”

Both-and

What the data actually shows

Both cohorts tracked infections prospectively — parents recorded symptoms daily, which is more rigorous than retrospective recall and reduces the classification errors that plague this kind of research. The infection types that showed the strongest links were common colds (71% increased risk in the highest-burden group), acute otitis media (ear infections, nearly doubled risk), tonsillitis, and pneumonia. Gastroenteritis and fever episodes, by contrast, showed no association — suggesting the link is specific to respiratory infections rather than infectious burden in general.

Critically, the researchers controlled for two major confounders. First, genetic risk — specifically filaggrin (FLG) gene variants, which are the strongest known genetic risk factor for atopic dermatitis. The respiratory infection association held independently of FLG status. Second, antibiotic exposure — a confounding pathway that has been proposed before (antibiotics disrupt the gut microbiome, and gut microbiome disruption is associated with atopy). The association held independently of antibiotic use as well.

This makes a simple antibiotic-mediation explanation less likely. Something else is going on.

The mechanism that’s proposed — and what remains genuinely unknown

The researchers propose that repeated respiratory infections in early childhood may “influence immune development in ways that predispose children to atopic disease.” This is plausible within what is known about the hygiene hypothesis and its more nuanced successors.

The core idea: early immune programming — the process by which an infant’s immune system learns to calibrate its responses to environmental triggers — may be shaped by the pattern and type of infections encountered in the first years of life. Repeated respiratory infections might skew immune development toward the type 2 inflammatory pathway associated with atopic disease (eczema, asthma, allergic rhinitis).

But the researchers are honest that causality is not established. Three explanations remain plausible: infections directly alter immune development in ways that predispose to atopy; underlying immune dysregulation makes a child more susceptible to both infections and atopic disease; or a third unmeasured factor drives both. These are meaningfully different mechanisms with meaningfully different clinical implications, and this study cannot tell them apart.

What this finding doesn’t mean for day-to-day parenting

This is worth being direct about. An association between respiratory infection burden and eczema risk does not mean:

Preventing colds will prevent eczema
Children who have had many colds are destined to develop eczema
Parents of children with eczema did something wrong by allowing infection exposure
There is a clinical intervention based on these findings available now

Atopic dermatitis has a complex aetiology. Genetics, skin barrier function, the microbiome, allergen exposure, and immune development all contribute. The respiratory infection link is a new signal in a crowded explanatory field, not a single cause that, if addressed, prevents disease.

The best-evidenced preventive approaches for high-risk infants remain: regular emollient use from birth to support the skin barrier, avoidance of known contact irritants, and breastfeeding where possible (associated with lower atopy risk in some but not all studies). None of these change based on this new finding.

Why this research direction matters

The value of this work is in pointing researchers toward the immune development pathway as a mechanism. If repeated respiratory infections do alter immune programming in early life, it raises the question of whether interventions that modulate that pathway — preventive probiotics, specific vaccination strategies, microbiome interventions — could reduce atopic disease risk. Those are hypotheses that now have a better evidence foundation to be tested.

For eczema specifically — which affects approximately one in five Australian children and causes significant quality of life burden for children and families — any mechanistic lead toward prevention is worth following carefully.

My two cents

If you have a child under three who has had a lot of colds, this research doesn’t change what you should do today. Standard general practice advice for eczema-prone children stands: early, consistent emollient use, avoid harsh soaps and synthetic fragrances, use fragrance-free laundry products, and see your GP if skin symptoms are causing distress or sleep disruption.

If you are pregnant or planning a family and have a personal or family history of atopy, the most well-supported conversation to have with your GP or obstetrician remains about emollient use from birth and early allergen introduction strategies — not about infection prevention as an eczema strategy.

The research is worth knowing about because the mechanism it implies — that early immune programming shapes atopic risk — is likely to generate testable prevention interventions in the next five to ten years. That’s the time horizon to watch.

Verdict: maybe — the signal is consistent and dose-dependent across two independent cohorts, but causality is unproven and no prevention implication follows yet. Worth watching as the mechanism is investigated.

Sources cited

Early respiratory infections linked to childhood eczema risk. Medical Republic, 13 August 2026. https://www.medicalrepublic.com.au/early-respiratory-infections-linked-to-childhood-eczema-risk/128154
Cohort study on early respiratory infections and atopic dermatitis risk. COPSAC2010 and VDAART cohorts. JAMA Dermatology, July 2026. https://jamanetwork.com/journals/jamadermatology
Copenhagen Prospective Studies on Asthma in Childhood (COPSAC). https://www.copsac.com