How much caffeine is safe during pregnancy?

The 200 mg ACOG threshold

The American College of Obstetricians and Gynecologists (ACOG) recommends limiting caffeine intake to less than 200 mg per day during pregnancy. This is based on cohort studies showing that intake above 200 mg/day is associated with a small but statistically significant increase in miscarriage risk and a modest reduction in birth weight1.

What 200 mg looks like

• Brewed coffee (12 oz): ~200 mg — right at the limit
• Espresso (1 shot): ~65 mg — three shots = 195 mg
• Black tea (8 oz): ~50 mg — four cups gets you to 200 mg
• Green tea (8 oz): ~30 mg
• Diet cola (12 oz): ~40 mg
• Dark chocolate (1 oz): ~20 mg
• Decaf coffee (12 oz): ~5 mg (yes, decaf has some)

Why this matters

Caffeine crosses the placenta freely and the fetus cannot fully metabolize it — pregnancy also slows maternal caffeine clearance, meaning the same dose stays in your system longer than pre-pregnancy2. By the third trimester, caffeine half-life can be 15+ hours (vs. ~5 hours non-pregnant).

Sources you might miss

Watch for caffeine in: pre-workout supplements, weight-loss products, some pain relievers (Excedrin contains caffeine), energy drinks, kombucha, and “natural” energy products containing guarana or yerba mate — both naturally caffeinated3.

Practical guidance

• Stick to one moderate coffee per day OR several cups of tea, not both.
• Consider switching to decaf for second and third cups.
• Don’t add caffeine via supplements or energy drinks.
• If you experience anxiety, insomnia, or palpitations: reduce further.