You can start serving canned tuna to your baby as early as 6 months old, when they begin eating solid foods. The key is choosing the right type of tuna, keeping portions small, and preparing it in a texture your baby can handle safely at their stage of development.
Which Type of Canned Tuna Is Safest
Choose chunk light (skipjack) tuna packed in water. This checks two important boxes at once. Light tuna contains an average of 0.118 parts per million of mercury, compared to 0.407 ppm in white (albacore) tuna. That’s roughly 3.5 times less mercury. A quarter of white tuna cans tested in one study exceeded 0.5 ppm, so the difference between the two is significant for a small body.
Water-packed tuna also has a better nutritional profile than oil-packed. Tuna stored in water retains more omega-3 fatty acids (EPA and DHA), which support brain development. Oil-packed tuna absorbs the packing oil, which shifts the fat balance in a less favorable direction. Look for cans or pouches labeled “chunk light tuna in water” or “skipjack tuna in spring water.”
The FDA categorizes canned light tuna as a “Best Choice” fish, meaning it can be eaten twice a week. Albacore falls into the “Good Choice” category, which has a lower recommended frequency. Bigeye tuna should be avoided entirely due to high mercury levels.
How Much Tuna to Serve
The FDA’s serving size guidelines start at 1 ounce for children ages 1 to 3, with up to two servings per week from the “Best Choice” list. For babies between 6 and 12 months, portions should be even smaller, roughly a tablespoon or two mixed into another food. There’s no need to serve a full ounce at this stage. Think of tuna as an ingredient you’re adding to a meal, not the main dish.
Sodium is the other reason to keep portions small. Canned tuna drained from brine contains about 320 mg of sodium per 100 grams, and even tuna packed in water runs around 290 mg per 100 grams. For a baby between 7 and 12 months, the recommended daily sodium intake is only 370 mg. A couple of tablespoons of tuna (roughly 25 to 30 grams) adds about 75 to 95 mg of sodium, which is a reasonable amount alongside the rest of the day’s food. Rinsing the drained tuna under water for 30 seconds helps wash off some of the surface salt.
Textures by Age
At 6 months, your baby can’t pick up small flakes or chew firm pieces. Mash or flake the tuna and mix a small amount into something soft they’re already eating: porridge, mashed avocado, or plain whole-milk yogurt. You can also spread a thin layer of mashed tuna onto a strip of toast and let your baby gnaw on it. Soft tuna cakes work too, as long as each cake is large enough that your baby can’t fit the whole thing in their mouth.
Around 9 months, most babies start developing a pincer grasp, using their thumb and pointer finger to pick up small pieces. At this point you can offer bite-sized flakes of tuna on their own, or cut soft tuna patties into small pieces. Mixing tuna into a thick, scoopable food and letting your baby self-feed with their hands or a preloaded spoon also works well.
By 18 months, toddlers can usually manage a small tuna sandwich, holding it together and taking bites on their own.
Easy Ways to Mix and Serve It
Plain canned tuna has a strong flavor and a dry texture that many babies find unappealing. Mixing it with something creamy makes it much easier to eat. A spoonful of plain whole-milk yogurt, a bit of mashed avocado, or a small amount of cream cheese all work. The NHS suggests mixing drained tuna with a heaped teaspoon of mayonnaise and a teaspoon of plain yogurt, which creates a mild, smooth mixture you can spread or scoop.
Some simple combinations to try:
- Tuna and avocado mash: Half an avocado mashed with a tablespoon of drained tuna. Soft, mild, and easy to spread on toast strips.
- Tuna stirred into porridge or oatmeal: Sounds odd, but the warm cereal softens the fish texture. Add a squeeze of lemon if your baby has tried citrus.
- Tuna patties: Mix tuna with a little mashed sweet potato or cooked egg to bind it, then pan-fry gently. Serve in strips for younger babies or bite-sized pieces for older ones.
- Tuna with yogurt and sweetcorn: For babies 9 months and older who can handle small soft pieces, stir a few kernels of tinned sweetcorn into a tuna-yogurt mix.
Watching for an Allergic Reaction
Fish is one of the major food allergens, so the first time you offer tuna, serve it early in the day and give only a small amount. This gives you the rest of the day to watch for signs of a reaction. Offer tuna on its own or mixed with a food your baby has already tolerated, so you can tell what caused any symptoms.
Signs of a fish allergy can include hives or red spots on the skin, vomiting, diarrhea, belly pain, swelling (especially around the face or eyes), wheezing, coughing, or difficulty breathing. Mild skin reactions like a few hives may appear within minutes to a couple of hours. If your baby shows any trouble breathing, throat tightness, or sudden limpness, that’s a medical emergency. Once your baby tolerates tuna without a reaction, you can serve it regularly, which actually helps maintain tolerance.
Quick Checklist Before You Serve
- Type: Chunk light or skipjack tuna in water
- Drain and rinse: Pour off the liquid and rinse briefly to reduce sodium
- Portion: One to two tablespoons mixed into food, up to twice a week
- Texture: Mashed or mixed into soft food for 6 months, bite-sized flakes by 9 months
- First time: Serve a small amount early in the day and watch for allergic symptoms