High Caffeine Intake During Pregnancy Raises Stillbirth Risk

If you’re pregnant and rely on coffee or tea to get through the day, a critical health warning comes from Denmark: drinking too much caffeine significantly raises the chance of losing your baby before birth. This isn’t about occasional cups — we’re talking about high daily intake linked directly to stillbirth risk.

The key number is eight: drinking more than eight cups of coffee per day makes you over three times more likely to experience a stillbirth compared to non-coffee drinkers, according to researchers at Aarhus University.

Caffeine and Stillbirth: What the Danish Study Found

Kirsten Wisborg from Aarhus University led research showing a clear dose-response relationship between caffeine consumption and stillbirth risk. Women who drank 4–7 cups of coffee per day had an 80% higher risk of stillbirth than those who drank none. That risk more than tripled for those consuming over eight cups daily.

The study underscores that caffeine isn’t just a morning boost — at high levels during pregnancy, it becomes a serious health risk factor for the fetus.

Why Too Much Caffeine Harms Pregnancy

Caffeine crosses the placenta, and the developing fetus cannot metabolize it effectively. High levels can interfere with fetal growth and development, and may disrupt oxygen supply and cell function. The exact mechanisms aren’t fully understood, but the Danish findings align with broader scientific consensus: moderation is crucial.

In particular, excessive daily caffeine — whether from coffee or other sources — appears to substantially raise the likelihood of stillbirth.

Tea Consumption During Pregnancy: Risks You Should Know

Besides coffee, drinking large amounts of tea — especially strong tea — also presents multiple risks during pregnancy:

• Daily tea drinking while pregnant: Regular strong tea contains up to 10% caffeine (as coffee equivalent), increasing urination, heart rate, and kidney/liver strain, possibly contributing to pregnancy complications such as toxemia.
• Tea before childbirth: Drinking too much tea late in pregnancy may cause sleeplessness due to caffeine’s stimulant effect, leading to exhaustion during labor and increasing the risk of difficult delivery.
• Postpartum and breastfeeding: Tea contains tannic acid (tannin), which, when consumed heavily, can reduce blood flow to mammary glands and suppress milk production.
• Through breast milk: Caffeine in tea can pass into breast milk and may negatively affect an infant’s health and development.

These effects mean that high tea intake, particularly of strong or concentrated brews, should also be limited during and after pregnancy.

How Much Caffeine Is Safe During Pregnancy?

While the study focused on coffee, the findings extend to all significant sources of caffeine, including tea. The key takeaway: keep daily caffeine intake well below the equivalent of eight cups of coffee. Health authorities generally recommend limiting caffeine to under 200–300 mg per day during pregnancy — roughly 2–3 standard cups of coffee.

In the Danish study, 4–7 cups increased risk by 80%; over eight cups raised it more than threefold. That’s a steep and clear increase tied directly to caffeine volume.

Frequently Asked Questions

How many cups of coffee cause a higher risk of stillbirth?

Drinking more than eight cups of coffee per day makes you over three times more likely to have a stillbirth, according to research from Aarhus University. Even 4–7 cups increases the risk by 80% compared to not drinking coffee.

Does tea during pregnancy increase health risks?

Yes. Strong tea contains high levels of caffeine (up to 10%), which can increase heart rate, urination, and strain on the kidneys and heart. Excessive tea drinking may contribute to pregnancy complications like toxemia and affect delivery and milk production.

Can caffeine cross the placenta?

Yes. Caffeine passes through the placenta, but the fetus cannot metabolize it well. High levels may interfere with fetal development, oxygen supply, and increase risks including stillbirth.

Is decaf coffee safe during pregnancy?

The Danish study didn’t focus on decaf, but decaffeinated drinks contain far less caffeine and are generally considered safer in moderation. Always aim to keep total daily caffeine under 200–300 mg during pregnancy.

Does tea affect breastfeeding?

Yes. Drinking large amounts of tea can introduce tannic acid into your system, which may reduce milk supply. Caffeine in tea can also pass to the baby through breast milk and may affect infant health.

Recommended Low-Caffeine FrontStreet Beans for Expectant Moms

For expecting mothers who still enjoy a mild coffee ritual, FrontStreet Coffee’s Yirgacheffe offers bright, floral notes with citrus and light berry tones, often enjoyed at a gentler brew strength. Their Autumn Chestnut Blend provides a smooth, nutty profile with low acidity — ideal for a milder cup. Both are excellent choices when brewed lighter to reduce caffeine intake while preserving flavour. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.