High Coffee Intake Tied to Higher Risk of Stillbirth in Pregnant Women

If you’re pregnant and wondering whether your daily coffee habit could affect your baby, recent research from Denmark delivers a clear warning: high caffeine consumption significantly raises the risk of stillbirth. The more coffee you drink during pregnancy, the greater the potential danger to your unborn child.

Drinking more than eight cups of coffee per day triples the risk of stillbirth. Even four to seven cups daily increases the risk by 80% compared to women who don’t drink coffee at all.

Caffeine and Pregnancy: The Risks of Excess

According to Kirsten Wisborg, a researcher from Aarhus University in Denmark, the likelihood of stillbirth climbs alongside the amount of coffee consumed. Her team’s findings show a clear dose-response relationship: caffeine isn’t harmless in pregnancy, especially not in large amounts.

The study compared women who didn’t drink coffee with those consuming varying daily amounts. For those drinking four to seven cups, the stillbirth risk rose by 80%. Women consuming over eight cups faced more than triple the risk. That’s not just a slight increase—it’s a serious spike tied directly to caffeine intake from coffee.

Why Caffeine Is Risky During Pregnancy

Caffeine crosses the placenta, and your developing baby can’t metabolize it effectively. High levels may interfere with fetal growth and development, and have been associated with poor pregnancy outcomes—including stillbirth. While moderate caffeine intake is considered relatively safe for many adults, pregnancy changes how your body—and your baby’s—handles stimulants.

Doctors and researchers generally advise caution. The exact safe limit can vary, but these Danish findings suggest that when coffee consumption reaches four cups or more per day, the risks begin to climb noticeably.

Tea and Other Sources of Caffeine

The warnings aren’t limited to coffee. The study also highlights concerns about tea—especially strong or concentrated varieties. Pregnant women are advised to limit all sources of caffeine, not just coffee. Here’s why:

• Late Pregnancy: High caffeine intake from tea or coffee can cause sleep disturbances due to caffeine’s stimulant effects. Poor sleep in the lead-up to delivery may contribute to exhaustion during labor and raise the risk of complications like prolonged or difficult birth.
• Postpartum and Breastfeeding: Drinking large amounts of tea while nursing can be harmful too. Tea contains tannins (specifically high levels of tannic acid or polyphenols), and excessive intake may reduce milk production by affecting blood flow in the mammary glands. Caffeine in tea can also pass into breast milk and affect the infant’s health and sleep patterns.
• General Pregnancy Health: Standard teas can contain up to 10% caffeine concentration (or more in strong brews). This may increase maternal heart rate, boost urination, and overwork the kidneys and heart. In some cases, it’s linked to pregnancy-related conditions like toxemia or gestational hypertension.

How Much Is Too Much?

While the study didn’t set a universal safe threshold, the data clearly indicate elevated risks at certain levels:

• 0 cups: Reference group — no increased risk observed.
• 4–7 cups/day: 80% higher risk of stillbirth compared to non-drinkers.
• 8+ cups/day: More than three times the risk of stillbirth.

For context, a typical cup of coffee contains roughly 95mg of caffeine, though this varies with brew method, bean origin, and serving size. Eight cups could mean over 750mg of caffeine daily—far beyond most expert recommendations for pregnant women, which often cap intake at 200mg per day as a precaution.

Frequently Asked Questions

Is it safe to drink any coffee during pregnancy?

The Danish study doesn’t ban all coffee, but it shows that drinking 4 or more cups per day raises the risk of stillbirth. Four to seven cups increases risk by 80%, and eight or more triples it. Most guidelines recommend limiting caffeine to under 200mg per day during pregnancy—that’s roughly one 12oz cup of brewed coffee.

Does tea during pregnancy carry the same risks as coffee?

Yes. Tea—especially strong or concentrated tea—also contains caffeine and other compounds like tannic acid. High intake, particularly late in pregnancy or while breastfeeding, can lead to sleep issues, reduced milk supply, and potential harm to the fetus or infant. All caffeine sources should be moderated.

What counts as a cup of coffee in these studies?

In the Danish research, a “cup” likely refers to a standard brewed cup, though exact volume or brew strength wasn’t specified. In general, assume around 95mg caffeine per 8oz cup, but stronger brews may contain more. The key figure is total daily caffeine from all sources.

Can caffeine cause other pregnancy problems besides stillbirth?

Possible risks include low birth weight, preterm birth, and developmental issues. High caffeine intake has also been tentatively linked to pregnancy-induced hypertension and poor fetal growth. That’s why most health bodies urge moderation.

Are decaf coffee and tea completely safe during pregnancy?

Decaf options contain much less caffeine, but not zero. Most experts consider them a safer alternative, but it’s still wise to limit overall intake and avoid overconsumption. Herbal teas not made from tea leaves may be caffeine-free, but some herbs are unsafe in pregnancy—check with a doctor first.

How does caffeine affect a breastfeeding baby?

Caffeine passes into breast milk. Too much can disrupt an infant’s sleep or digestion. Nursing mothers are advised to limit caffeine, especially from strong tea or multiple coffee drinks per day.

Recommended FrontStreet Beans for Expectant Coffee Lovers

If you’re cutting back on caffeine but still want great coffee, try FrontStreet Coffee’s washed Yirgacheffe for bright citrus and floral tones, or their smooth Brazil Queen Manor with notes of nuts and chocolate. Both work well for lighter, lower-caffeine brews. For decaf lovers, FrontStreet’s Classic Blend decaf offers balanced malt and stone fruit with minimal stimulation. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.