Hydration During Pregnancy: How Much Water Is Enough?

Why Hydration Needs Increase During Pregnancy

Your body has a lot of extra work to do when you're pregnant. It builds new tissue, carries nutrients to your baby, and increases your blood volume. It also creates amniotic fluid, the liquid that cushions your baby in the womb. All of these processes depend on having enough water on board, which is why your daily fluid needs go up once you're expecting.

Meeting those higher needs supports your baby's development and helps your own body handle the changes of pregnancy. In practice, many pregnant women fall short: a 2024 study found that about 67% of the pregnant women surveyed were not meeting hydration recommendations, and roughly 63% said they didn't know what those recommendations were. Understanding your target can be a helpful first step.

Sources: PLOS Digital Health, Aeroflow Breastpumps, Birthly, Suffolk Health, Lyndhurst Gynecologic Associates

Recommended Daily Fluid Intake for Pregnant Women

Two major organizations offer guidance, and they're slightly different. The Institute of Medicine recommends a total water intake of 3.0 liters per day from all sources—beverages plus water-rich foods. That works out to about 2.3 liters (roughly 10 cups or 80 ounces) as total beverages, including drinking water.

The American College of Obstetricians and Gynecologists (ACOG) gives a wider range: 8 to 12 cups a day (64 to 96 ounces, or 1.9 to 2.8 liters) of total water. ACOG's range recognizes that needs vary by body size, climate, and physical activity.

In short, a practical target is to aim for about 10 cups of fluids a day, and adjust based on your thirst, activity, and how you feel. If you're active or it's hot, you'll likely need more.

Sources: PLOS Digital Health, Genesis OBGYN, Birthly, Suffolk Health

Electrolyte Needs and Nutritional Sources

Electrolytes—such as potassium, magnesium, and calcium—help regulate your body's fluid balance. Getting enough from food can support proper hydration during pregnancy.

Bananas, oranges, green leafy vegetables, yogurt, and avocados are all good sources of key electrolytes. Including these in your daily diet can help maintain your body's fluid equilibrium.

Coconut water is often mentioned as a hydrating drink that contains natural electrolytes. Plain water and a balanced diet can usually meet your needs, but if you're losing fluids through vomiting, replacing electrolytes becomes more important.

Sources: PLOS Digital Health, Aeroflow Breastpumps, Genesis OBGYN

Dehydration Risk in Pregnancy: Signs and Complications

Dehydration happens when your body loses more water than you take in. During pregnancy, that can become serious more quickly because your fluid needs are higher.

Signs of dehydration to watch for include dark yellow urine, dizziness, a dry mouth, headaches, and fatigue. If you notice these, try increasing your fluids and call your provider if they don't improve.

If you notice decreased fetal movement (fewer kicks than usual), contact your healthcare provider or go to urgent care immediately. This is an urgent warning sign that needs prompt evaluation, not just extra fluids.

Severe dehydration may raise the risk of complications. Research has linked it to potential issues such as low amniotic fluid, neural tube defects, preterm labor, and poor fetal growth, though direct cause-and-effect isn't fully established. Mild dehydration is more common and usually easy to correct.

Sources: Aeroflow Breastpumps, Genesis OBGYN, Birthly, Suffolk Health

Tips for Staying Hydrated When Dealing with Morning Sickness

Nausea and vomiting in early pregnancy can make it hard to keep fluids down. But you still need to replace what you lose, so it's worth finding a strategy that works for you.

Some women find it easier to sip small amounts throughout the day rather than drinking a large glass at once. Trying cold beverages, clear broths, or ice chips may also help. Some sources suggest coconut water as an option because it contains electrolytes, which can be helpful if you're losing fluids through vomiting.

If you're vomiting repeatedly, you may need medical support. Talk to your provider about safe ways to protect your hydration while managing morning sickness.

• Sip fluids slowly and frequently rather than gulping down a big glass.
• Try cooling drinks or frozen treats if the taste or temperature helps.
• Ask your obstetric provider about strategies if vomiting is severe.

Sources: Aeroflow Breastpumps, Genesis OBGYN, Birthly, Suffolk Health

Hydration in the Third Trimester and During Breastfeeding

As your pregnancy progresses into the third trimester, your baby is growing rapidly, and your body is preparing for birth. Your hydration needs remain elevated, so continue to aim for the 8 to 12 cups of total water per day recommended by ACOG. Watch for signs of dehydration like dark urine, and increase your fluids if you're active or in a hot climate.

Some women experience swelling in the third trimester, which might make them think they should cut back on fluids. In fact, staying well hydrated helps your body manage the increased blood volume and can reduce the risk of urinary tract infections. If you have concerns about swelling, talk to your provider.

If you experience preterm contractions, staying hydrated is important, but it does not replace medical evaluation. Contact your healthcare provider immediately if you have symptoms of preterm labor.

After your baby arrives, if you breastfeed, your hydration needs remain important. A common recommendation is to drink at least eight 8-ounce cups of fluids a day, plus more if you feel thirsty. Your milk supply depends on your own fluid balance, so keeping a water bottle nearby during feeds can be a useful habit.

Sources: Happy Mama Organics, Aeroflow Breastpumps