Parent Guide
Low FODMAP Diet for Kids
A pediatric GI walkthrough of the low FODMAP diet for children with IBS or functional abdominal pain, including phases, food lists, and how to do it safely.
Recurring belly pain, bloating, gas, and unpredictable bathroom trips are some of the most common reasons families come to a pediatric gastroenterologist. For children with irritable bowel syndrome (IBS) or functional abdominal pain, a structured low FODMAP trial can be one of the most effective tools we have.
This guide explains what the diet is, how to run it in three clear phases, and the guardrails we use to keep it safe and short term for growing kids.
The low FODMAP diet is a diagnostic tool, not a lifestyle. It works best when it is planned with a pediatric GI and a registered dietitian and paired with the rest of your child's care plan.
When we consider a low FODMAP trial
- Diagnosed IBS or functional abdominal pain
- Recurrent bloating, gas, and cramping after meals
- Alternating constipation and diarrhea
- Symptoms that have not improved with fiber and hydration alone
- Older child or teen who can help track foods and symptoms
- Family able to work with a registered dietitian for 2 to 3 months
Before starting, we rule out celiac disease, inflammatory bowel disease, lactose intolerance, and other conditions that need targeted treatment rather than a broad dietary change.
The three phases
Phase 1: Elimination
Goal: Remove high FODMAP foods to see if symptoms improve.
Swap wheat for oats or rice, cow's milk for lactose free milk, onion and garlic for the green tops of scallions and garlic infused oil. Keep meals simple and consistent so it is easy to tell what is helping.
Phase 2: Reintroduction
Goal: Test one FODMAP group at a time to find your child's specific triggers.
Add back small portions of a single food (for example mango for fructose) for 3 days, then washout for 3 days. Track symptoms daily. Most kids tolerate several groups without any problem.
Phase 3: Personalization
Goal: A relaxed, sustainable diet that avoids only the specific triggers you identified.
This is the goal. Nearly every child leaves the low FODMAP program eating a broader diet than they had before, with a clear plan for the few foods that cause trouble.
High vs low FODMAP at a glance
Limit during elimination
- Cow's milk, yogurt, and ice cream
- Wheat bread, pasta, and most cereals
- Apples, pears, mangoes, watermelon, cherries
- Onion, garlic, cauliflower, mushrooms
- Beans, lentils, chickpeas
- Honey and high fructose corn syrup
- Sugar free gum or candy with sorbitol, xylitol, or mannitol
Enjoy during elimination
- Lactose free milk, hard cheeses, lactose free yogurt
- Rice, oats, quinoa, sourdough spelt bread
- Strawberries, blueberries, oranges, grapes, kiwi, firm bananas
- Carrots, cucumber, bell peppers, spinach, zucchini, potato
- Eggs, chicken, beef, fish, tofu
- Maple syrup in small amounts
- Garlic infused oil and green tops of scallions for flavor
Portion size matters. Small servings of some higher FODMAP foods may be tolerated, and your dietitian will calibrate this to your child's age and appetite.
Doing it safely with kids
- Keep the elimination phase short. Four to six weeks is usually enough to know if it will help.
- Always move into reintroduction. Staying elemental long term can lead to nutrient gaps and food fear.
- Work with a registered dietitian who is trained in the Monash low FODMAP framework and pediatric nutrition.
- Involve your child in age appropriate ways so meals do not feel like punishment.
- Do not start if your child has a history of restrictive eating, ARFID, or an eating disorder without a specialist team.
Related reading
Pediatric IBS
Diagnosis, red flags, and our clinical approach to IBS in children.
Chronic Abdominal Pain
How we work up recurring belly pain and rule out serious causes.
Lactose Intolerance
A common overlap with IBS and often the first FODMAP we test.
SIBO
When bacterial overgrowth mimics IBS and how we test for it.
Functional Dyspepsia
Upper belly cousin of IBS that responds to a similar approach.
Kids Gut Health Hub
Foundational habits that support a healthy gut in every child.
Frequently asked questions
What is the low FODMAP diet?
FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. These are short chain carbohydrates that pull water into the intestine and ferment quickly, which can trigger gas, bloating, and pain in children with IBS. The low FODMAP diet temporarily limits these foods to calm symptoms, then reintroduces them to identify the specific triggers.
Is the low FODMAP diet safe for children?
It can be safe when supervised by a pediatric gastroenterologist and a registered dietitian. It is designed as a short term diagnostic tool, not a long term way of eating. Because it restricts several nutrient dense foods (dairy, wheat, many fruits and vegetables), children should never stay in the elimination phase longer than 4 to 6 weeks.
How long does each phase last?
Phase 1 (elimination) lasts 2 to 6 weeks. Phase 2 (reintroduction) tests one FODMAP group at a time over 6 to 8 weeks. Phase 3 (personalization) is ongoing and includes only the specific foods your child reacts to. Most kids end up with a much less restrictive long term diet than they started with.
Which foods are high FODMAP?
Common high FODMAP foods include cow's milk and yogurt, wheat bread and pasta, apples, pears, mangoes, watermelon, onions, garlic, beans, lentils, and sugar free gums and candies with sorbitol or xylitol. Portion size matters, so working with a dietitian is important.
Which foods are safe on a low FODMAP diet?
Low FODMAP staples include lactose free milk, hard cheeses, eggs, meats, fish, rice, oats, quinoa, potatoes, carrots, cucumber, bell peppers, spinach, strawberries, blueberries, oranges, grapes, and bananas that are not overripe.
How do I know if my child needs it?
The low FODMAP diet is most helpful for children with a clear diagnosis of IBS or functional abdominal pain who have not improved with first line steps like fiber, hydration, and stress management. Before starting, your child should be evaluated to rule out celiac disease, inflammatory bowel disease, and other conditions that need different treatment.
Ready to try a supervised trial?
Dr. Mendez can evaluate your child, confirm the diagnosis, and connect you with a pediatric dietitian to run the low FODMAP program safely from start to finish.