How does childhood antibiotic use affect the risk of developing inflammatory bowel disease?

Antibiotics are important for fighting bacterial infections, but using them in childhood may have unintended effects on the developing gut microbiome. The gut microbiome is the community of bacteria and other microbes living in your digestive tract. Disrupting this community early in life might increase the risk of inflammatory bowel disease (IBD), which includes Crohn's disease and ulcerative colitis. Research suggests that childhood antibiotic use is associated with a modest increase in IBD risk, likely due to changes in the gut microbiome.

What the research says

A 2025 meta-analysis pooled data from 10 studies and found that children who received antibiotics had a 42% higher risk of developing IBD compared to those who did not (risk ratio 1.42) ². The risk was higher for Crohn's disease (59% increase) than for ulcerative colitis (23% increase) ². These findings support the idea that early-life antibiotic exposure can alter the gut microbiome and immune system development, potentially triggering IBD in susceptible individuals ¹⁰¹¹. The gut microbiome plays a key role in training the immune system, and disruptions from antibiotics may lead to an overactive inflammatory response ¹¹. While the exact mechanisms are still being studied, the evidence consistently points to childhood antibiotics as a modifiable risk factor for IBD ²¹⁰.

What to ask your doctor

• Given my child's medical history, when are antibiotics truly necessary and when can we consider watchful waiting?
• Are there ways to support my child's gut health during and after antibiotic treatment, such as probiotics or dietary changes?
• What are the early signs of inflammatory bowel disease that I should watch for in my child?
• If there is a family history of IBD, does that change how we approach antibiotic use?
• Are there alternatives to antibiotics for common childhood infections that might lower the risk of gut microbiome disruption?