Fish allergy in babies

Finned fish such as salmon and cod are nutritious early foods (a source of omega-3s) and can be introduced around 6 months. The main practical concern is removing bones.

Safe ways to serve fish

Well-cooked, flaked salmon or cod with all bones carefully removed
Fish mashed into a soft, mild base

⚠️ Remove every bone and check carefully. Choose lower-mercury fish (like salmon) and cook thoroughly. Finned fish and shellfish are separate allergens.

Want age-by-age prep, nutrition, and storage? See the full fish food guide →

Ready to start? Fish for babies: mercury rules and prep →

Signs of an allergic reaction

Hives or welts, unless they are only around the mouth with nothing else
Swelling of the lips, face, or eyes
Vomiting
A change in behavior, like becoming very unsettled
If any of these show up soon after a food, stop that food and get medical advice right away
Call emergency services right away for swelling of the tongue, swelling or tightness in the throat or trouble swallowing, difficult or noisy breathing, wheezing, a cough that keeps going, or a hoarse voice
Also call emergency services for swelling of the lips or face that comes on suddenly or keeps spreading, vomiting that repeats, hives that spread over the body, skin or lips that turn pale or blue, a baby who goes floppy or is hard to wake, or signs in more than one part of the body, like hives plus vomiting

General tips for introducing allergens

Most babies are ready for solids around 6 months, once they can sit with support and show interest.
Introduce one new allergen at a time and let its watch window pass, about 3 days, before the next, so any reaction can be traced to a single food.
Once an allergen is tolerated, keeping it in the diet regularly is part of current guidance.
Offer allergens earlier in the day (not right before bed) so you can watch for any reaction.
If your baby has severe eczema or a known food allergy, talk to your pediatrician before introducing peanut or egg.

New to allergens? Read the complete introduction guide →

About fish allergy

General, sourced background, not medical advice and not based on your baby's logs. Your allergist decides what is right for your child, especially on cross-reactivity.

How common: Up to about 1% of people report a finned-fish allergy, and roughly 40% first react as adults. (FARE)
Outgrowing it: A fish allergy usually lasts. Only about 1 in 5 people outgrow a seafood allergy with time. (ASCIA)
Cross-reacts with: More than half of people allergic to one fish react to other fish too, so allergists often advise avoiding all fish until testing says otherwise. Fish and shellfish allergies are separate, so one does not mean the other. (FARE)

Frequently asked questions

When can babies eat fish?

Well-cooked, deboned finned fish like salmon can usually be introduced around 6 months. It’s a common early allergen worth introducing rather than delaying.

Sources

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Let the app track the big 9 for you

Log a first taste and YummyYucky opens a watch window on that allergen, tells you when it is clear to start the next, and keeps the ones that go fine in rotation. Free.

Start the allergen tracker, free

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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