Is unpasteurised milk safe during pregnancy?

The verdict

No. This is one of the few pregnancy food questions where every national authority says the same thing in the same words, and none of them offers a moderation option.

Avoid unpasteurised milk in every form: cows', sheep's and goats' milk, and the cream, yoghurt, butter and ice cream made from it. Avoid cheese made from unpasteurised milk unless it has been cooked until steaming hot all the way through. Raw milk sold as a farm-gate product, from a vending machine, or online direct from a producer is the same product as raw milk from anywhere else.

Pasteurised dairy is safe, unrestricted, and worth eating - it is a major source of calcium and iodine in pregnancy.

What pasteurisation actually does

Pasteurisation heats milk to a defined temperature for a defined time - typically 72C for 15 seconds - which is enough to kill the vegetative bacteria that cause human disease without meaningfully changing the milk's nutritional value. It is not sterilisation. It is a targeted intervention against a specific list of pathogens, and that list is the reason it exists.

Raw milk can carry Listeria monocytogenes, Shiga toxin-producing E. coli including O157, Salmonella, Campylobacter, Brucella and Mycobacterium bovis. Three of those are specifically dangerous in pregnancy for different reasons.

Listeria is the one the pregnancy guidance is built around. It grows at refrigerator temperatures, so chilling does not control it. The FDA states that pregnant women are about 10 times more likely to get listeriosis than other healthy adults, and that an estimated 1 in 6 of all cases occur in pregnant women. Maternal illness is often mild; the pregnancy outcome is what is at stake.

E. coli O157 does not target pregnancy specifically but causes severe illness and, in a minority of cases, haemolytic uraemic syndrome. Raw milk is a recognised vehicle.

Brucella and M. bovis are the historical reasons pasteurisation became compulsory. Brucellosis in pregnancy is associated with pregnancy loss.

Cheese is where the countries part company

Raw milk itself is unanimous. Raw milk cheese is not, and the split runs along a line most people would not guess.

The UK and Canada permit unpasteurised hard cheese. The NHS lists "pasteurised or unpasteurised hard cheeses, such as cheddar, gruyère and parmesan" under foods that are safe to eat. Health Canada likewise permits pasteurised and unpasteurised hard cheeses such as romano and parmesan. Both regulators are drawing the line by moisture and rind, not by pasteurisation: a hard cheese is dry, acidic and salty enough that listeria does not grow well in it, whichever milk it started as.

The US does not. The CDC's avoid list reads "any type of cheese when made with (raw) unpasteurized milk", with no hardness exemption, and its safer column names hard cheeses only "when made with pasteurized milk". The FDA takes the same line. ACOG says avoid raw milk soft cheeses and states that soft cheeses made with pasteurised milk are safe.

So a raw-milk cheddar is a normal food in the UK and Canada and a food to avoid in the US. Both positions are current and both are internally coherent.

The 60-day rule is not a pregnancy exemption

US law permits raw milk cheese to be sold if aged 60 days or more. That is a market-access manufacturing standard, not a safety carve-out for pregnancy - and the FDA's own surveillance sampling of 1,606 legally aged raw milk cheeses still found listeria, salmonella and E. coli O157, each at under one percent, with generic E. coli in 5.4%. No US pregnancy guidance treats 60-day aging as making a raw-milk cheese acceptable.

Cooking is the universal get-out

A raw-milk cheese baked into a tart, melted into a sauce brought to temperature, or cooked until steaming hot has had the treatment pasteurisation would have given it. The CDC says so explicitly: raw milk cheeses become a safer choice when heated to 165F or until steaming hot. FSANZ specifies 75C internally for baked soft cheese.

The practical difficulty is labelling. In the UK and EU, cheese made from unpasteurised milk must say so, usually as "made with raw milk" or "au lait cru". On a deli counter that information is often not in front of you. If you cannot confirm it, and it is soft, treat it as raw.

Where you can even buy it

In the UK, the sale of raw cow's drinking milk is legal in England, Wales and Northern Ireland, but only direct to the consumer by registered production farms - at the farm gate, including vending machines and direct online sales - or by a farmhouse catering operation. Sales are banned outright in Scotland. Where it is sold it must carry a warning at the point of sale, and Food Standards Agency guidance states that people who are pregnant are among the vulnerable groups who should not consume it.

That warning label is doing real work. It is the regulator telling you, at the point of purchase, that this product is not for you right now.

If you have already had some

One glass of raw milk or one slice of raw-milk cheese is a low-probability exposure, and there is no test or preventive treatment offered on the basis of exposure alone.

The two things to watch have very different clocks. E. coli, salmonella and campylobacter announce themselves within hours to a few days, with diarrhoea, cramps and fever - if that happens, prioritise fluids and contact your midwife or doctor, particularly if there is blood in your stool or you cannot keep fluids down. Listeria is the slow one: ACOG notes symptoms can appear as late as two months after eating contaminated food, and the presentation is often just fever, chills and muscle aches. Any fever in pregnancy after eating an at-risk food is worth a phone call, and worth mentioning what you ate.

If a product you have consumed is subject to a recall, contact your maternity team even without symptoms. That is the one situation where clinicians will actively monitor.

Where guidance differs

On raw milk itself it does not. On raw milk cheese it does, sharply.

Raw milk: unanimous. The NHS lists unpasteurised milk, cream, yoghurt, butter and ice cream on its avoid list. The CDC lists unpasteurised milk and cheese among foods more likely to spread harmful germs. The FDA says the same. Health Canada goes further than any of them at the level of law - pasteurisation of milk for sale has been mandatory in Canada since 1991, so raw drinking milk simply cannot be sold there. FSANZ lists raw milk as higher-risk, and New Zealand Food Safety says avoid all unpasteurised milk and dairy products. There is no dissent anywhere.

Raw milk hard cheese: a genuine three-way split. The NHS lists pasteurised or unpasteurised hard cheeses such as cheddar, gruyère and parmesan as safe to eat. Health Canada permits pasteurised and unpasteurised hard cheeses such as romano and parmesan, while banning pasteurised soft and semi-soft cheeses like brie, camembert and havarti. The CDC and FDA permit neither: any cheese made with unpasteurised milk is on the avoid list regardless of hardness. A raw-milk cheddar is a safe food in London and Toronto and an avoid food in Atlanta.

Legality varies more than advice does. Raw drinking milk is banned outright in Scotland and in Canada, sold only direct from registered producers in England, Wales and Northern Ireland, and restricted by state in the US and Australia. None of that changes the advice: where it is legal, the point-of-sale warning label exists precisely because some people should not drink it, and pregnancy is on that list.