Can I drink tea while pregnant?

The verdict

Yes, in moderation. Ordinary tea - black tea, builder's tea, English breakfast, Earl Grey, chai, iced tea - is not restricted in pregnancy as a drink. It is restricted only through its caffeine, and that limit is a daily total across everything you consume.

The number to hold onto is the NHS estimate: 75mg of caffeine in a cup of tea, against a daily ceiling of 200mg. That is roughly two and a half mugs, if tea is your only source of caffeine.

This page is about ordinary tea from the tea plant. Herbal teas are a different question with a different limit, and green tea has its own page.

The numbers, from named sources

The NHS publishes its own estimates rather than leaving you to guess:

• 75mg in a cup of tea, black or green
• 100mg in a cup of instant coffee, with filter and coffee-shop coffee containing more
• 40mg in a can of cola
• 80mg in a 250ml can of energy drink
• Less than 25mg in a 50g bar of plain dark chocolate
• Less than 10mg in a 50g bar of plain milk chocolate

The ceiling of 200mg a day is shared by the NHS, ACOG, the HSE in Ireland and Australian guidance. ACOG's Committee Opinion frames it as a reassurance rather than a warning: moderate caffeine consumption below 200mg a day does not appear to be a major contributing factor in miscarriage or preterm birth.

The NHS reason for the limit is that too much caffeine has been linked to a higher chance of miscarriage and stillbirth. The HSE adds that it can increase the risk of your baby being small or growing slowly.

Why the 75mg figure is only a starting point

Real cups vary enormously, and the variables are ones you control.

Brewing time is the biggest. Caffeine extracts steadily, so a bag left in for four minutes gives considerably more than one dunked for thirty seconds. If you take your tea weak, you are drinking less caffeine than the estimate; if you leave the bag in while you drink it, more.

Mug size matters too. The NHS figure is for a cup. A large mug holds noticeably more than that.

Tea type is less important than people expect. Black, green and white tea all come from the same plant, and the differences between them are smaller than the differences between a strong brew and a weak one. Assam-heavy blends and strong breakfast teas sit at the higher end.

Decaffeinated tea is not caffeine-free, but the residual amount is small and it is a genuine way to have more cups without spending the allowance. Australian guidance names decaffeinated tea and coffee as its first suggestion for cutting down.

The iron problem, which nobody mentions

This is the part of the tea question that gets missed, and it may matter more day to day than the caffeine.

NHS guidance on iron deficiency anaemia lists what to eat and drink less of if diet is contributing: tea, coffee, milk and dairy, and foods high in phytic acid such as wholegrain cereals, which can stop your body absorbing iron from other foods and tablets. It adds that large amounts of these foods and drinks make it harder for your body to absorb iron.

The mechanism is tannins - polyphenols abundant in tea - which bind non-haem iron in the gut and prevent its absorption. Non-haem iron is the form in beans, lentils, dark green vegetables, fortified cereals and iron tablets, which is most of what pregnancy iron advice is built around.

Iron deficiency anaemia is common in pregnancy, and many women are prescribed iron tablets. Drinking a mug of tea with the tablet, or with an iron-rich meal, works directly against it.

The fix is timing rather than abstinence. Have your tea between meals rather than with them, and keep it well away from an iron tablet. NHS guidance on iron tablets suggests orange juice may help absorption; safefood in Ireland gives the same tip, recommending salad vegetables, citrus fruits or a glass of fruit juice with meals to help absorb iron.

What counts as tea for this purpose

• Black tea, builder's tea, breakfast blends, Earl Grey. Around 75mg a cup by the NHS estimate.
• Chai and masala chai. Black tea with spices. Same caffeine, plus milk. Shop-bought chai lattes are often made with syrup and can be substantial free sugar.
• Iced tea. Usually brewed black tea. Bottled iced teas add sugar and vary in strength; the label will give the caffeine content on many.
• Milk tea and Hong Kong style tea. Strongly brewed, so at the higher end.
• Oolong and white tea. Same plant, same caffeine question.
• Rooibos, honeybush and fruit infusions. Not tea, and naturally caffeine-free. These fall under herbal teas, where the NHS limit is four cups a day and anything containing liquorice root is out. The HSE names ginger, peppermint, camomile and fruit teas as safe.
• Matcha. Whole ground green tea leaf, so more caffeine per serving than an infusion. That belongs with green tea rather than here.

Adding it up in a real day

The mistake people make is counting only the obvious sources. Two mugs of tea is 150mg. Add one can of cola at 40mg and you are at 190mg, with chocolate still to come.

Caffeine is also in some cold and flu remedies and painkillers, which is worth checking on the packet before taking anything.

If you are trying to reduce, do it gradually. Caffeine withdrawal causes headaches, and a headache is not a symptom you want to be interpreting in pregnancy.

If you have already had more than 200mg

One day over the limit is not a crisis. The 200mg figure is a daily average target, not a threshold above which harm occurs.

The NHS position on foods and drinks that should have been limited is that if you have already had a small amount, it is unlikely to affect your baby if you did not become ill. There is no test, nothing to report and nothing to do retrospectively.

What is worth doing is looking at your usual daily pattern rather than one bad afternoon. If you are routinely at four or five mugs plus cola, that is a habit worth adjusting, and switching some of them to decaffeinated is the easiest way.

Where guidance differs

Barely at all on the number. The UK, US, Australia and Ireland all use 200mg a day.

They differ in how they present it. The NHS is alone in publishing a per-drink table, which is why its 75mg figure gets quoted everywhere. The HSE describes the limit as about two mugs of instant coffee. FSANZ takes a different approach entirely, stating that there is no recognised health-based guidance value such as an Acceptable Daily Intake for caffeine, while noting that around 240mg a day was the level its expert working group linked to increased anxiety in adults.

The real divergence is on herbal teas, not ordinary tea. The NHS sets a four-cup limit on herbal tea and rules out liquorice root. Ireland permits ginger, peppermint, camomile and fruit teas and advises against all others. Neither restriction applies to black tea, which is limited only by its caffeine.