Best Fish For Children
Ask almost any nutritionist for one food worth getting onto your child’s plate, and fish will be near the top of the list. It’s one of the healthiest, most complete foods a growing child can eat — rich in the omega-3 fats that build young brains and eyes, packed with protein for growing bodies, and one of the few natural sources of vitamin D for strong bones. Cooked simply and chosen well, it’s clean, wholesome nourishment without the added sugar and salt of so much “children’s food”.
This guide covers everything a parent needs: why fish matters so much for children, the seven best fish to choose (and why), which to avoid, how mercury really works, easy family recipes, and how to buy fish that’s fresh, safe and properly prepared. As a family-run fishmonger, we hand-select every fish at Billingsgate Market and debone it to order — exactly what you want for little ones.
The foundation
Why Fish Is Important For Children
Fish earns its reputation as a childhood superfood honestly. Here’s what it brings to a growing body — and why it’s worth making a regular part of family meals.
The power of omega-3
Oily fish are one of the richest natural sources of long-chain omega-3 fatty acids (EPA and DHA). DHA in particular is a key building block of a child’s developing brain, eyes and nervous system — which is exactly why oily fish is so valued in a growing child’s diet.
Protein for growing bodies
Fish provides complete, high-quality protein that’s easy for little ones to digest — the raw material for building muscle, tissue and a strong, healthy body during the fastest years of growth.
Vitamin D for bones
Oily fish is one of the few foods that naturally contains vitamin D, which helps children absorb calcium and build strong bones and teeth. In a cloudy country like the UK, that dietary source is genuinely useful.
Brain development
The DHA in fish supports healthy brain development and function. Introducing fish early and regularly helps give children a steady supply of these important fats during the years their brains are growing fastest.
Eye health
DHA is also a major structural component of the retina. A diet that includes oily fish supports healthy vision as children grow — another quiet, long-term benefit of a fish-friendly plate.
Naturally low in the wrong stuff
Fresh fish is lean, unprocessed and free from the added sugar and salt that fill so many “kid foods”. Cooked simply, it’s about as clean and wholesome as a meal gets.
Chosen for little ones
Top 7 Best Fish For Children
Every fish here is mild or manageable in flavour, low in mercury, rich in nutrients and gentle in texture — with notes on taste, age suitability and cooking. All can be introduced from around six months, well-cooked and carefully deboned.
Sea Bass Levrek
Low mercurySea Bream Çipura
Very low mercurySalmon Somon
Low mercurySardines
Low mercuryMackerel İstavrit
Low mercuryCod
Very low mercuryHaddock
Very low mercuryEvery one of these can be hand-picked fresh and pin-boned to order — browse the online fish shop, or read our guide to choosing fresh fish.
Simple & wholesome
Easy Family Fish Recipes
Four gentle, child-friendly ideas that turn fresh fish into a meal the whole family will happily eat.
Salmon & sweet potato fishcakes
Flake cooked salmon through mashed sweet potato, shape into little cakes and bake until golden. Soft, sweet and perfect for small hands — and a brilliant way to use leftovers.
Baked sea bass with lemon
Bake a deboned sea bass fillet with a squeeze of lemon and a drizzle of olive oil, then flake through buttery mash or soft pasta for a gentle, everyday lunch.
Sardines on toast
Mash cooked, deboned sardines with a little cream cheese and spread onto soft toast fingers — an easy, iron- and omega-3-rich meal ready in minutes.
Simple fish pie
Fold flaked cod or haddock through a light white sauce with soft vegetables, top with mash and bake. A comforting family classic that hides plenty of goodness.
Getting the balance right
How Often Should Children Eat Fish?
A little and often is the ideal. General UK guidance suggests around two portions of fish a week for the family, including one portion of oily fish such as salmon, sardines or mackerel, with smaller portions for children than adults.
Oily fish is where the valuable omega-3 is concentrated, so it’s worth including regularly — but it’s sensible not to rely on a single type of fish every day. Variety keeps meals interesting and spreads the nutritional benefits. Portion sizes and frequency should suit your child’s age, so follow current NHS advice and your health visitor’s guidance, particularly for babies and very young children.
A Note On Safety & Allergies
Fish is one of the common food allergens, so introduce it on its own and watch for any reaction, especially the first few times. Always cook fish through, remove every bone with care, and avoid adding salt for babies and young children. If your family has a history of food allergies, speak to your GP or health visitor before introducing fish. This guide is general information aligned with NHS and Food Standards Agency advice — it isn’t a substitute for individual medical guidance.
Know what to skip
Fish To Avoid
A short, sensible list keeps things safe without making fish complicated.
Skip the high-mercury fish
Children should avoid shark, swordfish and marlin, which are higher in mercury than the everyday fish in this guide. They’re rarely on a family menu anyway — and none are needed to eat brilliantly.
Careful with bones & salt
Always remove bones thoroughly, and avoid salty or heavily smoked fish for babies and young children. Choose unsmoked haddock and cod for little ones, and keep seasoning minimal.
No raw fish for young children
Skip raw fish and raw shellfish (such as sushi or oysters) for young children — always cook fish through until it flakes and is piping hot.
Variety over excess
There’s no need to overthink it — simply vary the fish you serve rather than giving large amounts of one type every day, and you’ll naturally stay on the safe side.
Mercury, Explained Simply
Mercury occurs naturally in the sea in tiny amounts, and fish absorb it as they feed. Large, long-lived predatory fish — like shark, swordfish and marlin — sit at the top of the food chain and accumulate the most over their lifetimes, which is why they’re the ones to avoid for children.
The fish in this guide are the opposite: small oily fish like sardines and mackerel, quick-growing white fish like cod and haddock, and farmed favourites like salmon, sea bass and sea bream are all low or very low in mercury. That’s exactly why they’re so well suited to growing children — all the goodness of fish, with mercury kept low.
Low-mercury by nature
The best children’s fish are small, quick-growing or farmed — the very fish we deliver each week.
Freshness matters most
Buying Fresh Fish For Your Family
When you’re cooking for children, freshness and careful preparation matter more than ever. Fresh fish tastes better, is easier to debone cleanly, and gives you confidence about what’s on your child’s plate.
Choose genuinely fresh
Look for bright, clear eyes, red gills, firm flesh and a clean sea smell — the same checks we make by hand at the market. Our guide on how to choose fresh fish walks you through all of them.
Ask for it deboned
The single most useful thing for family cooking: have your fishmonger pin-bone and fillet the fish for you. We prepare every order to your liking, so it arrives ready and safe for little ones.
Fresh, fast delivery
A short supply chain keeps fish at its best. We hand-pick at Billingsgate and deliver fresh across London — see Billingsgate fish delivery and fresh fish delivery London.
Ask us anything
Not sure what suits your child’s age or taste? Message us on WhatsApp — we’re parents and fishmongers, and we’re always happy to help you choose.
Why House O Fish
We’re a family-run fishmonger who hand-selects every fish at Billingsgate Market before dawn, checks it individually for freshness, and prepares it to order — scaled, gutted, filleted and pin-boned exactly how you need it. For families, that care makes all the difference: fish that’s genuinely fresh, properly deboned and ready to cook.
Ordering is personal and simple through our WhatsApp community, and we deliver fresh across London each week. Learn more about us, explore the online fish shop, or get in touch — we’d love to help your family eat more good fish.
Made for family cooking
Hand-selected, pin-boned to order and delivered fresh — exactly what you want when you’re cooking for children.
Parents ask
Frequently Asked Questions
Mild, low-mercury fish are ideal — salmon, sea bass, sea bream, cod, haddock, sardines and mackerel are all excellent. They’re rich in omega-3, protein and vitamin D, gentle in flavour and, when cooked through and deboned, wonderfully easy for children to eat.
Fish can usually be introduced from around six months as part of weaning, well-cooked, boneless and with no added salt. Fish is a common allergen, so introduce it on its own and watch for any reaction. Always follow current NHS weaning guidance and speak to your health visitor or GP, especially if there’s a family history of allergies.
Small fish and farmed favourites tend to be lowest — sardines, cod, haddock, sea bream, sea bass and salmon are all low or very low in mercury, which is one reason they’re so well suited to children.
General guidance recommends around two portions of fish a week, including one portion of oily fish such as salmon, sardines or mackerel, with smaller portion sizes for children. Follow NHS advice and your health visitor’s guidance for your child’s age.
Children should avoid shark, swordfish and marlin, which are higher in mercury. Also avoid raw fish and raw shellfish for young children, keep added salt low, and always remove bones carefully.
Yes — salmon is one of the best fish for children. It’s mild, soft and flaky, popular with fussy eaters, and one of the richest sources of the omega-3 DHA that supports brain and eye development.
Omega-3 fatty acids, especially DHA, are key building blocks of the developing brain, eyes and nervous system. Oily fish is one of the best natural sources, which is why including it regularly is so valuable during childhood.
Cook it through, remove every bone carefully, avoid added salt, and introduce new fish one at a time while watching for allergic reactions. Buying genuinely fresh, well-prepared fish — deboned to order — makes all of this far easier.
Yes, and they’re superb for growing children thanks to their high omega-3 content. Their flavour is bolder, so introduce them gradually and in small amounts, well-cooked and deboned.
House O Fish hand-selects fresh fish at Billingsgate Market and delivers across London. We’ll scale, gut, fillet and pin-bone your fish to order — ideal for family cooking — and you can order simply through our WhatsApp group.
Feed them the good stuff
Fresh Fish, Ready For Your Family
Give your children the very best start with genuinely fresh, low-mercury fish — hand-selected at Billingsgate, pin-boned to order and delivered across London. Join our WhatsApp community to see this week’s catch and order in a couple of messages.
Popular with families: Fresh Salmon · Fresh Sea Bass · Fresh Sea Bream · Fresh Sardines · Fresh Horse Mackerel