When people say, “trust your gut,” they usually mean listening to instinct. But a child’s gut does more than guide feelings. It also affects their health, mood and even how they learn.
Researchers are learning that gut health plays a big role in children’s development. From helping the immune system to supporting brain function, the trillions of bacteria in the digestive system work hard every day.
We talked with Swati Kolpuru, MD, a pediatric gastroenterologist at Banner Children’s, to learn why gut health matters for kids and what you can do to support it.
What do we mean by “gut health?”
The gut includes the stomach, intestines and microbes (bacteria, fungi and viruses) that live inside them. Together, they are called the gut microbiome.
“Gut health is how well a child’s digestive system works: breaking down food, absorbing nutrients, moving things along comfortably and eliminating waste,” Dr. Kolpuru said. “It also means having a strong gut lining that keeps harmful substances out while letting nutrients in, plus a balanced microbiome that aids in digestion, makes vitamins, trains the immune system and helps regulate inflammation.”
A child’s microbiome starts developing at birth and is shaped by many things.
“Vaginal birth versus C-section, antibiotic exposure, breastfeeding, illness, stress and diet all affect how the microbiome forms,” Dr. Kolpuru said. “A healthy microbiome supports digestion and immune balance, influencing overall well-being.”
The gut-brain connection
The gut and brain communicate through the gut-brain axis. It is a two-way communication system that involves nerves, hormones and chemical messengers.
About 90% of serotonin, the “feel good” chemical, is made in the gut rather than the brain. This means gut health can affect mood, focus and sleep.
“Changes in the microbiome can affect this communication, influencing mood, stress tolerance and attention,” Dr. Kolpuru said. “Many children with GI issues also experience anxiety and mood symptoms, and treating GI problems can improve day-to-day focus and well-being.”
What research says about gut health and behavior
While the field is still new, research shows promising links between gut health and children’s health:
- Mood and anxiety: Healthy gut bacteria may lower rates of anxiety and depression. Imbalances increase stress responses.
- Focus and learning: Some studies suggest gut bacteria may influence attention and memory, which could relate to ADHD.
- Autism spectrum disorder (ASD): Some studies show differences in the gut microbiome of children with autism. While cause and effect aren’t clear, better gut health may improve GI symptoms that are common in kids with ASD.
- Sleep quality: Gut bacteria help make melatonin (a hormone that controls sleep). Children with healthier guts may rest better, which supports learning and mood.
- Nutrient absorption: Poor digestion can affect vitamins like iron, vitamin D and B12. When you lack these vitamins, it can show up as fatigue, irritability or trouble concentrating.
- Allergies, asthma, and chronic conditions: Early gut issues may raise the risk of allergies, asthma, inflammatory bowel disease and other chronic health issues later in life.
Signs your child’s gut may be out of balance
Some common red flags include:
- Frequent stomachaches, gas or constipation
- Ongoing diarrhea
- Gas and bloating after meals
- Food sensitivities or allergies
- Skin problems like eczema
- Trouble falling or staying asleep
- Mood swings or irritability
- Trouble focusing in school
- Frequent infections
These symptoms can have many causes. But if they show up often, it may be worth talking to your child’s health care provider.
How to support a healthy gut
You can do a lot to nurture gut health through everyday choices. Dr. Kolpuru offered these tips:
1. Build a balanced plate
“Fruits and vegetables, whole grains, beans and lentils, nuts and seeds (in age-safe forms) and fermented foods like yogurt or kefir with live cultures are great choices,” Dr. Kolpuru said. “Prioritize water and limit ultra-processed snacks and sugary drinks, which can disrupt the microbiome.”
2. Focus on probiotics and prebiotics
Probiotic foods have helpful bacteria, such as yogurt, kefir, or small amounts of sauerkraut. Prebiotic foods feed the bacteria and include bananas, oats, garlic, onions and asparagus.
“Supplements can be considered in certain situations, such as after a stomach virus, during or after antibiotics or for specific GI conditions,” Dr. Kolpuru said. “But the strain and dose should always be discussed with your child’s provider.”
3. Keep routines consistent
“The gut likes rhythm,” Dr. Kolpuru said. Regular mealtimes, consistent sleep and daily activity all support digestion and the microbiome.
4. Encourage outdoor play
Time in nature and with pets helps kids build microbial diversity and immunity.
5. Support stress management
Stress directly affects the gut-brain connection. Dr. Kolpuru recommends calming routines, such as mindfulness, deep breathing, or yoga, to help reduce symptoms.
6. Use antibiotics wisely
Use antibiotics only when necessary and follow your health care provider’s instructions. Afterward, restore balance with probiotic-rich foods and a nutrient-dense diet.
When to talk to a specialist
Some symptoms need medical attention. Contact your child’s health care provider if they have:
- Blood in stool (poop)
- Chronic vomiting
- Severe or ongoing diarrhea
- Constipation that doesn’t improve with diet or fluids
- Unexplained weight loss or poor growth
- Very restricted eating
The bottom line
Your child’s gut is more than just a digestive system. It is a powerhouse that supports mood, focus, immunity and growth. As Dr. Kolpuru sums up, “the gut likes rhythm.” That means consistent meals, movement and routines are just as important as what’s on the plate.
If you have concerns about digestion, growth or behavior, contact your health care provider or a Banner Health specialist. Together, you can find safe and effective ways to support your child’s health and well-being.
