Is salt safe in my baby's food?

The verdict

Add none, and watch what else you are giving.

The NHS instruction is unambiguous: babies should not eat much salt, as it's not good for their kidneys. Do not add salt to your baby's food or cooking water, and do not use stock cubes or gravy, as they're often high in salt. It adds a line worth remembering: remember this when you're cooking for the family if you plan to give the same food to your baby.

The number sits on a different NHS page. Its maximum daily salt intakes by age are: under 1 year, less than 1g; 1 to 3 years, no more than 2g; 4 to 6 years, no more than 3g; 7 to 10 years, no more than 5g; and 11 years and over, no more than 6g, which the NHS describes as around 1 teaspoon.

Since 6g is about a teaspoon, a baby's entire daily allowance of less than 1g is roughly a sixth of a teaspoon, or around a hundredth of an ounce. It is a very small budget, and almost none of it should come from anything you deliberately add.

Why babies specifically

The NHS gives the reason in five words: it's not good for their kidneys. That is a fair summary of a real physiological limit. An infant kidney has a lower glomerular filtration rate and a reduced capacity to concentrate urine, so the amount of sodium it can clear in a day is small. Sodium that cannot be excreted is retained, and retained sodium pulls water with it.

The second concern is longer-range and behavioural. The NHS puts it as: too much salt can give your child a taste for salty foods and contribute to high blood pressure in later life. Salt preference is learned early and is fairly durable, which is why the guidance is framed as a habit to avoid establishing rather than only a dose to stay under.

Health Canada's version, in its Nutrition for Healthy Term Infants recommendations, is to recommend foods prepared with little or no added salt or sugar, and it applies that from six months onwards as complementary foods are introduced. It notes that commercial infant foods are not needed and can be high in added sugar, and points to Canada's Food Guide advice to limit luncheon meats, sausages and pre-packaged meats higher in salt and fat.

Where the salt actually comes from

Almost nobody salts a baby's puree. The salt gets in through ordinary adult food, which is exactly why the NHS frames its advice around family cooking.

The NHS names the offenders directly. Avoid salty foods like bacon, sausages, chips with added salt, crackers, crisps, ready meals and takeaways. And separately: do not use stock cubes or gravy, as they're often high in salt.

Stock cubes are the single biggest trap in home cooking, because they are how most people build flavour. A standard stock cube can carry well over a gram of salt on its own, which is a whole day's allowance for a baby dissolved into one pan. Low-salt or no-added-salt stock, or simply herbs, garlic, onion, lemon and cooking water from vegetables, do the same job.

The CDC's list for young children is similar in shape: avoid feeding foods high in salt (sodium) to young children, naming some canned foods, choosing low sodium or no salt added instead, processed meats such as lunch meats, sausages, hot dogs and ham, and some frozen dinners. It adds that some snack foods and store-bought packaged foods marketed for toddlers are high in sodium, and tells parents to check the Nutrition Facts Label.

The quiet ones

Bread and cheese are the sources people never think of, because neither tastes salty. A slice of ordinary bread and a small piece of cheddar can together account for most of a baby's daily budget. Neither is a food to ban; both are foods to count.

Other quiet contributors: baked beans, ham, smoked salmon, olives, soy sauce, yeast extract spreads, and adult breakfast cereals. Anything designed for adult palates is designed with adult salt levels.

What to do instead

Cook the family meal without salt and season your own plate at the table. This is the single change that solves the problem, and it is why the NHS phrases the advice the way it does. The baby gets the same food, minus the seasoning step.

Build flavour with things that are not salt: onion and garlic softened slowly, black pepper, cumin, paprika, cinnamon, herbs, tomato, lemon or lime juice, and the cooking liquid from vegetables. Babies do not need bland food. They need unsalted food.

Read labels on anything sold for babies too. Products marketed as baby or toddler snacks are not automatically low in salt, and the CDC specifically calls this out.

If your baby has had salty food

One salty meal is not an emergency. There is no test and nothing to undo, and the guidance is about habitual intake rather than a single exposure.

What matters is offering water, going back to unsalted food, and not repeating it. If a baby under one has had a large amount of salt, for example a whole adult portion of a salty ready meal or several stock-based meals in a day, and afterwards seems unusually thirsty, drowsy or irritable, or is passing much less urine than normal, ring your GP, health visitor or NHS 111 and say what they ate. Genuine salt poisoning in infants is rare but it is a real clinical entity, and it is worth naming the food when you call.

Where guidance differs

Only the UK publishes an infant number. The NHS gives less than 1g of salt a day under 12 months and no more than 2g from 1 to 3 years. That is an unusually specific figure for this age group, and it exists because the UK has run a national salt reduction programme with age-banded targets for two decades.

The US publishes no infant salt limit in its consumer guidance. The CDC's advice is categorical rather than quantitative: avoid feeding foods high in salt to young children, check the label, choose low sodium or no salt added. There is no gram figure for a baby anywhere in that guidance, so an American parent is being asked to avoid a category, not stay under a number.

Canada is closer to the US in form and to the UK in intent. Health Canada recommends foods prepared with little or no added salt or sugar and flags processed meats as higher in salt, but attaches no daily gram figure for infants.

None of these bodies disagree about what to do. They disagree about whether to give parents a number. If you want one rule that satisfies all three: add no salt to anything a baby under one eats, skip stock cubes, gravy and processed meat entirely, and treat bread and cheese as the two everyday foods worth keeping an eye on.