Caffeine in Pregnancy: How Much Is Safe?

Why limit caffeine during pregnancy?

Caffeine is a stimulant that crosses the placenta. While your body can process caffeine efficiently, your developing baby cannot break it down at the same speed. This means caffeine stays in the baby''s system for much longer than in yours.

Research has consistently linked high caffeine intake during pregnancy with negative outcomes. A large-scale study published in the BMJ found that caffeine consumption above 200mg per day was associated with an increased risk of fetal growth restriction. The CARE Study, a UK-based prospective cohort study of over 2,600 pregnant people, found that caffeine intake above 200mg per day was associated with lower birth weight.

At very high levels (above 300mg per day), some studies have found an association with increased miscarriage risk, though the evidence is not conclusive. Based on the available evidence, the NHS, NICE, and RCOG all recommend keeping caffeine intake below 200mg per day during pregnancy.

The 200mg daily limit

Keeping track of your caffeine intake is important because it adds up from multiple sources throughout the day. The 200mg limit includes all sources of caffeine, not just coffee.

Caffeine content of common drinks and foods

Note that coffee shop drinks often contain more caffeine than home-made versions. A large latte from a chain coffee shop may contain 150 to 200mg of caffeine in a single drink, potentially using your entire daily allowance in one go.

What 200mg looks like in practice

You could have 2 mugs of instant coffee per day and stay within the limit. Or 1 mug of filter coffee and 1 small bar of chocolate. Or 2 cups of tea and 1 can of cola. Or 1 espresso and 2 cups of tea.

The key is to be mindful of all sources and to count them up over the whole day.

How to cut down on caffeine

If you are used to drinking several cups of coffee a day, cutting down suddenly can cause withdrawal headaches and fatigue. A gradual approach works better.

Switch to decaf. Decaffeinated coffee and tea are safe during pregnancy. Modern decaffeination processes preserve flavour well. Most coffee shops offer decaf options.

Try half-and-half. Mix regular and decaf coffee together to gradually reduce your caffeine intake over a week or two.

Swap some drinks. Replace afternoon coffees with herbal teas (check they are pregnancy-safe), warm water with lemon, or fruit-infused water. Rooibos tea is naturally caffeine-free and has a similar body to regular tea.

Time it right. If you only have one caffeinated drink a day, have it when you need it most. Many people find a morning coffee is the one they value most.

Watch hidden sources. Energy drinks, some medications (check with your pharmacist), and chocolate all contain caffeine that can add up.

Are decaf and herbal teas safe?

Decaffeinated coffee and tea are safe during pregnancy. They contain only trace amounts of caffeine (around 2 to 5mg per cup).

Most herbal teas are safe in moderation (1 to 2 cups per day), but some should be avoided or limited. Peppermint and ginger teas are considered safe and can help with nausea. Raspberry leaf tea is traditionally used in late pregnancy but should be avoided before the third trimester. Liquorice root tea should be avoided as it may raise blood pressure. If you are unsure about a specific herbal tea, check with your midwife.