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From the YummyYucky team, founded by Nancy Nash

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Can Babies Eat Seaweed? A Little Goes Far

Seaweed like nori and wakame is very high in iodine, so a little as a flavor is plenty for babies. Moisten or crumble dry sheets so they do not stick to the roof of the mouth.

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When to introduce
Around 6 months, small amounts only
Common allergen?
No (not a top-9 allergen)
Texture
Moistened or crumbled small into food
Key nutrients
Iodine, minerals

Seaweed is a big family of sea vegetables, including the nori sheets on sushi and the wakame in miso soup. It carries a savory, briny flavor and a good hit of minerals, and babies can taste it from around 6 months. The catch is iodine: seaweed is one of the most concentrated iodine sources there is, and a baby needs only a tiny amount of iodine each day. That makes seaweed a flavor to offer in small amounts, not a serving to fill a bowl with. A pinch crumbled into a familiar food is plenty.

⚠️ Seaweed is very high in iodine, and too much iodine can be harmful for babies, so keep it to small amounts and no more than about once a week.14

Why it matters: Iodine is one of the few nutrients where more is not better: a baby needs only a small daily amount, and seaweed is concentrated enough that a pinch can deliver a lot at once, which is why "a little as a flavor" is the safest way to share it.

Prep School: how to prepare seaweed for baby-led weaning (BLW) and purées

🍴 Baby-led weaning

6 monthsCrumble a small pinch of nori or finely chop soft, rehydrated wakame into a familiar food like rice, avocado, or egg. Keep the amount small and moisten dry sheets so they do not stick.
9 monthsStir a little crumbled seaweed into soft grains, mashed vegetables, or a scrambled egg. It is still a flavoring, not a whole serving, so keep it to a small amount.
12 months+Offer small amounts of seaweed in mild family dishes like a low-salt miso soup or a little chopped into rice, and skip hijiki. The British Dietetic Association advises keeping brown seaweed and kelp to about once a week, and that is a sensible limit for any seaweed for a young child.

🥄 Purées

6 monthsCrumble a small pinch of nori or finely chop soft, rehydrated wakame into a familiar food like rice, avocado, or egg. Keep the amount small and moisten dry sheets so they do not stick.
9 monthsStir a little crumbled seaweed into soft grains, mashed vegetables, or a scrambled egg. It is still a flavoring, not a whole serving, so keep it to a small amount.
12 months+Offer small amounts of seaweed in mild family dishes like a low-salt miso soup or a little chopped into rice, and skip hijiki. The British Dietetic Association advises keeping brown seaweed and kelp to about once a week, and that is a sensible limit for any seaweed for a young child.

Is seaweed safe? Choking & prep

Seaweed's iodine content varies a lot from one kind to the next, and too much iodine can be harmful.14 The British Dietetic Association advises eating brown seaweed or kelp no more than once a week, and says nori, though usually lower in iodine, varies too.4 For a baby, keeping any seaweed to small amounts about once a week is the simple, careful rule. Two seaweeds need extra care. Hijiki, a black, shredded seaweed often cooked into rice and soups, is high in inorganic arsenic, and food safety agencies test it for arsenic, so skip it.2 Kombu, a kelp, can be so high in iodine that it can be unsafe for small children,3 so use kombu only to flavor a broth and lift it out. Small amounts of nori or wakame are the easier choices.

Sharing a pinch of seaweed with your baby? Log the try with the date and tag it yummy, meh, or yucky to remember how that briny new flavor landed.

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Nutrition

Seaweed is best known for iodine, a mineral the thyroid needs, but the point with babies is that a little goes a very long way. It also carries small amounts of other minerals. Because so little seaweed delivers a full dose of iodine, and because too much iodine is a problem, treat it as a seasoning your baby tastes now and then rather than a food they rely on for nutrients. Breast milk or formula, and a varied diet, cover iodine without needing seaweed.

Goes well with

Rice · Avocado · Scrambled egg · Cucumber · Soft tofu · Sweet potato

Storage & freezing

Keep dry nori and other dried seaweed in a sealed container away from moisture, and it stays crisp for months. Once you rehydrate wakame or other soft seaweed, treat it like a cooked vegetable: refrigerate in a sealed container and use within about a day. Store bought seaweed snacks are often salted, so check the label and keep salted kinds out of your baby's portion.

More vegetables to explore

🧅
ShallotAround 6 months
🍄
ShiitakeAround 9 months
🌶️
Shishito PepperAround 6 months
🥕
SkirretAround 6 months
🥒
Snake gourdAround 6 months
🫛
Sugar snap peasAround 6 months

Related reading

Common questions

When can babies eat seaweed?

Around 6 months, in small amounts as a flavoring. Because seaweed is very high in iodine, offer a small pinch crumbled or chopped into food rather than a full serving.

Why only small amounts of seaweed?

Seaweed is one of the richest iodine sources there is, and a baby needs only a tiny amount of iodine daily. Too much iodine can be harmful, so a little as a flavor is plenty.

How often can my baby have seaweed?

The British Dietetic Association advises eating brown seaweed or kelp no more than once a week, and says nori, though usually lower in iodine, varies too.4 For a baby, keeping any seaweed to small amounts about once a week is the simple, careful rule.

Is dry nori a choking risk for babies?

Dry nori sheets can stick to the roof of the mouth, which is startling for a new eater. Moisten the sheet or crumble it small into a moist food so it does not cling.

Is seaweed a common allergen?

Seaweed itself is not one of the top-9 allergens. Watch the dish it comes in, though, since sushi, miso soup, and seaweed snacks can include fish, soy, sesame, or added salt.

Can babies have seaweed snacks from the store?

Many packaged seaweed snacks are salted, and babies should not have much salt. Check the label, choose unsalted if you can, and keep it to a small amount.

Does my baby need seaweed for iodine?

No. Breast milk or formula and a varied diet supply iodine, so seaweed is a taste to explore, not a food your baby needs for nutrients.

How do I serve wakame to a baby?

Rehydrate the dried wakame until soft, chop it finely, and stir a small amount into rice, soup, or a mash. Keep the portion small, and add no salt to the dish.

Can I put seaweed in my baby's miso soup?

From about 12 months, a little chopped seaweed in a mild, low-salt miso soup is fine. Miso itself is salty, so keep the bowl small. Before then, stir the seaweed into rice, avocado, or egg instead.

Sources

  1. NIH Office of Dietary Supplements: Iodine
  2. Food Standards Australia New Zealand: Arsenic (hijiki seaweed is tested for inorganic arsenic)
  3. Food Standards Australia New Zealand: Inorganic arsenic and iodine in seaweed (kombu iodine can be unsafe for small children)
  4. British Dietetic Association: Iodine food fact sheet (brown seaweed or kelp no more than once a week; nori varies)

Further reading

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Last updated September 2026. Next review December 2026. How we write these: built from current published guidance from the AAP, CDC, FDA/EPA, NIAID, WHO, and other pediatric and public-health authorities, with sources cited on the page. See our editorial and medical policy for how we research, source, and update these, and how we double-check the food advice.

This is general information, not medical advice, and is not individualized for your baby. Always talk to your pediatrician about your baby's diet, introducing allergens, and any reaction. In an emergency, contact emergency services.

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