How Much Water Should You Drink When Pregnant?

Staying well hydrated is one of the simplest and most important things you can do for a healthy pregnancy. Your body needs extra fluid to support increased blood volume, produce amniotic fluid, transport nutrients to your baby, and help manage common pregnancy symptoms such as constipation, headaches, and swelling.

Official Hydration Recommendations for Pregnant Women

Most major guidelines (including ACOG) recommend 8 to 12 cups (64-96 ounces / about 1.9-2.8 litres) of fluid per day during pregnancy. A practical everyday target is roughly 2.1-2.6 litres of total fluid, with the majority coming from plain water.

Needs increase slightly in the later trimesters, in hot weather, or if you are active.

Key points:

1. Total fluid includes water, milk, herbal teas (caffeine-free), soups, and water-rich foods.

2. Aim for urine that is pale yellow. This is a reliable hydration check.

3. Drink consistently throughout the day rather than large amounts at once.

Why Extra Water Matters in Pregnancy

1. Supports the 40–50% increase in blood volume.

2. Helps form and maintain amniotic fluid.

3. Aids nutrient delivery and waste removal.

4. Reduces risk of constipation, urinary tract infections, and headaches.

5. May help manage mild swelling (oedema).

6. Supports overall energy and temperature regulation.

Signs of Dehydration

Watch for:

• Dark yellow or strong-smelling urine.
• Persistent thirst or dry mouth.
• Headache, dizziness, or fatigue.
• Reduced fetal movements (later pregnancy).
• Increased Braxton Hicks contractions.

Seek medical advice if you cannot keep fluids down due to vomiting or if symptoms are severe.

Practical Tips to Stay Hydrated

1. Carry a reusable water bottle and sip regularly.

2. Drink a glass with every meal and snack.

3. Flavour water with lemon, cucumber, or berries if plain water feels unappealing.

4. Include water-rich foods (watermelon, cucumber, oranges, soups).

5. Increase intake on hot days or when exercising.

6. Limit sugary drinks, excessive caffeine, and energy drinks.

Morning sickness can make drinking difficult in the first trimester. Try small, frequent sips, ice chips, or ginger-infused water. In the third trimester, more frequent bathroom trips are normal; do not cut back on fluids to avoid them.

Common Q&A

1. How much water should you drink when pregnant?
Most experts recommend 8 to 12 cups (64-96 ounces) of fluid per day. A common practical target is about 2-2.6 litres, mostly from plain water.

2. Why is hydration important during pregnancy?
Extra fluid supports increased blood volume, amniotic fluid production, nutrient transport, waste removal, and helps prevent constipation, headaches, and dehydration-related complications.

3. What are the signs of dehydration in pregnancy?
Dark yellow urine, strong thirst, dry mouth, headache, dizziness, fatigue, and (in later pregnancy) reduced fetal movements or more frequent Braxton Hicks contractions.

4. Does water intake change by trimester?
Needs increase modestly as pregnancy progresses. Many women need a bit more in the second and third trimesters, and extra fluid is required in hot weather or during exercise.

5. Can you drink too much water while pregnant?
It is uncommon, but excessive intake can lead to hyponatremia (low sodium). Focus on consistent sipping rather than large volumes at once and let thirst and urine colour guide you.

How Much Extra Water Do You Need per Trimester?

Trimester 1
Extra Water: +300 mL/day

Trimester 2
Extra Water: +300-500 mL/day

Trimester 3
Extra Water: +500-700 mL/day

Make Informed Choices

Whether you're in your first, second, or third trimester, this post provides essential information to help you make informed choices for a healthy pregnancy.

We've all heard for many years now that you should aim to drink eight glasses (8-ounce) of water per day.

And there are so many benefits to staying hydrated. But I want to answer the question - How much water should a pregnant woman drink?

8 Glasses a Day?

While drinking 8 glasses a day is still a good general guide; I recommend that you pose this question to your Dietitian or doctor to see what is best for you given your personal nutritional requirements.

They will be able to help you identify exactly how much water you should drink based on your requirements, body size and weight.

When you are participating in a pregnancy exercise class; it is important you have a bottle of water close by so you can drink when required. This will help to prevent dehydration. 

Is Drinking Too Much Water a Problem?

Drinking plenty of water each day will go a long way in helping you to improve your health.

But can you drink too much?

Yes, you can, but your first goal is to prevent dehydration.

As with anything, too much of anything can pose new problems so drinking excessive amounts is not what is recommended.

Drinking too much water can result in Hyponatremia which is when your sodium levels decrease.

Symptoms of Hyponatremia

1. Irritability

2. Confusion

3. Fatigue

4. Nausea or vomiting

5. Headache

6. Muscle spasms

7. Muscle cramps

8. Muscle weakness

9. Seizures

10. Coma

Did You Know?

Did you know that foods can make up around 20 percent of your total fluid requirements each day? Therefore, what you eat is also important.

So, along with drinking water, you should try and eat lots of fruits and vegetables.

Such as:

1. Spinach

2. Watermelon

3. Cucumbers

4. Green peppers

5. Celery

6. Berries

7. Cauliflower

One last tip.

Make sure you buy a bottle that is BPA free as research has been shown that the chemicals that go into making these bottles can be toxic.

Your health and that of your baby's depends on you making the right decisions!

Key Takeaway

• Aim for 2.1-2.6 L plain water/day (8-10 cups)
• Sip consistently, not chug
• Pale urine = your hydration KPI
• Adjust up in heat, exercise, or 3rd trimester 

Bottom line

Aim for 8-12 cups of fluid daily, prioritise plain water, monitor urine colour, and adjust based on activity, climate, and how you feel. Proper hydration is a simple, powerful way to support both you and your baby.

Resources

ACOG How much water should I drink during pregnancy?
Clear official recommendation of 8–12 cups per day and key benefits.

Tommy’s How much water should I drink in pregnancy?

Practical UK guidance with urine colour advice and fluid targets.

BabyCenter How much water should I drink in pregnancy?
User-friendly overview of amounts, signs of good hydration, and tips for increasing intake.

Article review: Article updated and reviewed by Kerryn Boyle on 17/09/2026.