Natto for Babies: When and How to Serve It
Natto is Japanese fermented soybeans with a sticky, stringy texture and a strong smell. Soy is a top-9 allergen, so introduce it on its own. Mash the beans for younger babies and serve plain from around 8 months.
- When to introduce
- Around 8 months
- Common allergen?
- Yes (soy, a top-9 allergen)
- Texture
- Mashed for younger babies, whole beans for older babies
- Key nutrients
- Protein, iron, vitamin K2, probiotics, fiber
When can babies eat natto?
Natto is a traditional Japanese food made from fermented soybeans, famous for its sticky, stringy texture and a strong, pungent smell that is very much an acquired taste. It is also a nutritional powerhouse, rich in protein, iron, and vitamin K2. Natto can join your baby's plate around 8 months. Because soy is a top-9 allergen, introduce it on its own at first, and mash the sticky beans for younger babies so the texture is easier to manage.
How to prepare natto for baby-led weaning (BLW) and purées, by age
Is natto safe? Choking & prep
Soy is a top-9 allergen, so introduce natto on its own and watch how your baby does before mixing it with other new foods. The sticky, whole beans can be a texture surprise for young eaters, so mash them for younger babies to make them easier to manage. Serve natto plain and skip the salty sauce and mustard packets it usually comes with, since babies do not need the added salt. Its strong flavor and smell may take some getting used to, which is completely normal.
Trying natto today? Log the first taste and it lands on your baby's tried-it list, dated and ready for the pediatrician.
Log natto today →Nutrition
Natto is remarkably nutritious. It offers protein and iron, both important for growing babies, plus vitamin K2, gut-friendly probiotics from the fermentation, and fiber. Serving it alongside a food rich in vitamin C helps your baby absorb the iron. It is one of the more nutrient-dense ways to introduce soy.
Goes well with
Storage & freezing
Keep natto refrigerated and use it by the date on the package. Once opened, eat within a couple of days. Natto also freezes well for up to a few months.
More proteins to explore
Introducing this allergen
Related reading
Frequently asked questions
When can babies eat natto?
Around 8 months. Mash the sticky beans for younger babies and serve them plain, without the salty sauce packets.
Is natto a common allergen?
Yes. Natto is made from soybeans, and soy is one of the top-9 allergens. Introduce it on its own and watch how your baby responds.
Why is natto so sticky and smelly?
The stickiness and strong smell come from fermentation. Both are normal, though the flavor is an acquired taste that may take a few tries.
Do I need to cook natto before serving it?
Natto is already fermented and ready to eat. Just mash it for younger babies and serve it plain without the sauce packets.
Sources
- American Academy of Pediatrics (HealthyChildren.org): Starting Solid Foods
- CDC: Foods and Drinks to Encourage and Limit
Track it in Yummy Yucky
Log first tries, get nudged through the allergen watch, and keep every bite in one place you can share with your pediatrician.
Start tracking for freeLast updated July 2026. How we write these: grounded in widely published pediatric guidance (the AAP, WHO, the NIAID 2017 allergen guidelines, and the LEAP study), and pending independent review by a pediatric professional. See our editorial and medical policy for how we research, source, and update these.
This is general information, not medical advice, and has not been individually reviewed for your baby. Always talk to your pediatrician about your baby's diet, introducing allergens, and any reaction. In an emergency, contact emergency services.
Some links in our guides are affiliate links: if you buy through them we may earn a small commission, at no extra cost to you. We only suggest things we'd actually use, and it never changes our guidance.