Hydration During Pregnancy: How Much Water You Really Need
Europe's EFSA adds 300 ml/day to a pregnant woman's total-water target, lifting it from 2.0 L to roughly 2.3 L per day. Here is what that figure means, what counts toward it, and the best drinks to get there.
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Hydration During Pregnancy: How Much Water You Really Need
Europe's EFSA (2010) sets pregnancy total-water intake at +300 ml/day above the 2.0 L/day non-pregnant adult-woman target — roughly 2.3 L/day. This is total water from all beverages plus food moisture, assuming moderate temperature and activity. Needs rise with heat, exercise, or vomiting, so confirm your target with your provider.
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Food and beverage authorities express fluid needs as a total-water Adequate Intake (AI) — all drinks plus the moisture in food. For non-pregnant adult women, the EFSA panel sets that target at 2.0 L/day, while the US Institute of Medicine (IOM 2004) sets a higher 2.7 L/day; both assume moderate temperature and ordinary activity (EFSA assumes a physical-activity level of 1.6). For pregnancy specifically, EFSA 2010 adds 300 ml/day on top of the non-pregnant value, lifting a woman's total-water target to roughly 2.3 L/day. Remember these are totals from all sources: per IOM's NHANES data, beverages and drinking water supply about 81% of total water and food about 19% — so most, but not all, comes from what you drink. These are population averages; needs rise with heat, exercise, and pregnancy symptoms such as vomiting. Always confirm your own target with your maternity care provider.
Recommended Daily Total-Water Intake in Pregnancy
| Group | Total-water target | Notes |
|---|---|---|
| Non-pregnant adult woman (EFSA) | 2.0 L/day EFSA 2010 Adequate Intake for total water in adult women, assuming moderate temperature and a physical-activity level of 1.6. Includes water from food plus all beverages. | |
| Pregnancy (EFSA) | ~2.3 L/day (2.0 L + 300 ml) EFSA 2010 adds 300 ml/day above the non-pregnant Adequate Intake for pregnancy, giving roughly 2.3 L/day of total water. | |
| Non-pregnant adult woman (IOM) | 2.7 L/day The US Institute of Medicine (2004) sets a higher total-water Adequate Intake for adult women than EFSA. Use one framework consistently rather than mixing the two. | |
| Lactation / breastfeeding (EFSA) | +700 ml/day For the period after birth while breastfeeding, EFSA adds 700 ml/day above the non-lactating Adequate Intake of the same age — a larger increment than pregnancy. |
Best Drinks During Pregnancy
Water (still or sparkling)
Plain water is the simplest way to reach the EFSA pregnancy target of about 2.3 L/day of total water. Both EFSA and IOM count drinking water and all other beverages toward your total, so water can do most of the work.
Milk and dairy drinks
Milk hydrates and adds calcium and protein useful in pregnancy. It counts toward your total-water intake just like water under both the EFSA and IOM total-water definitions.
Food with high water content
About 19% of total water comes from food in IOM's NHANES data, so soups, fruit, and vegetables genuinely contribute. The other ~81% comes from beverages and drinking water.
Diluted juice and herbal options
These count toward total water, but check caffeine and any herb safety with your provider. The figures here describe total-water targets, not the safety of specific ingredients in pregnancy.
How to Hit Your Pregnancy Hydration Target
- Aim for roughly 2.3 L of total water a day — the EFSA non-pregnant 2.0 L plus the +300 ml pregnancy increment — counting food moisture, not just glasses of water (EFSA 2010 Water DRV).
- Remember about 81% of total water typically comes from beverages and ~19% from food, so most of your target still comes from what you drink (IOM 2004).
- Increase intake above the baseline target in hot weather, with exercise, or if you have morning sickness or vomiting — the AI assumes only moderate temperature and activity (EFSA 2010).
- Pick one framework (EFSA ~2.3 L or IOM's higher women's baseline of 2.7 L) and follow it consistently rather than blending the two.
- Keep a bottle within reach and sip steadily through the day instead of drinking large amounts at once.
- After birth, if you breastfeed, plan to add about 700 ml/day over your non-lactating target (EFSA 2010).
Signs to Watch — and When to Check With Your Provider
Dark-yellow urine or noticeably reduced urination
Dry mouth, thirst, or feeling lightheaded
Persistent vomiting that stops you keeping fluids down
Headache, dizziness, or feeling faint
Strong, regular contractions or signs of preterm labor
Rapid heartbeat, confusion, or very little urine over many hours
If you experience severe symptoms, stop activity immediately and seek shade/rest. Seek medical attention if symptoms persist.
Medical Disclaimer: This page is general information, not medical advice. The total-water figures cited (EFSA 2010 +300 ml/day for pregnancy and the 2.0 L/2.7 L adult-women baselines) are population reference values that assume moderate temperature and activity; they are not personalized prescriptions. Pregnancy fluid needs change with heat, vomiting, medical conditions, and individual factors. Always confirm your own hydration target and any concerning symptoms with your doctor or midwife.
Estimate Your Daily Water Target
Use the hydration calculator to turn these total-water reference values into a daily goal, then confirm it with your maternity provider.
Use the Hydration CalculatorSources & Citations
- +300 ml/day for pregnancy — EFSA 2010 adds 300 ml/day to the non-pregnant adult-woman total-water Adequate Intake for pregnancy.[1]
- 2.0 L/day baseline; ~2.3 L/day in pregnancy — EFSA 2010 total-water Adequate Intake for non-pregnant adult women is 2.0 L/day, so the pregnancy target is roughly 2.3 L/day.[1]
- +700 ml/day for lactation — EFSA adds 700 ml/day above the non-lactating Adequate Intake for lactation/breastfeeding.[1]
- moderate temperature, PAL 1.6 — EFSA's water Adequate Intakes assume moderate environmental temperature and a physical-activity level (PAL) of 1.6.[1]
- 2.7 L/day (women) — The US Institute of Medicine (2004) total-water Adequate Intake for adult women is 2.7 L/day.[2]
- ~81% beverages / ~19% food — Per IOM NHANES data for 19-30-year-olds, beverages and drinking water supply about 81% of total water and food about 19%.[2]
- [1]EFSA 2010 Water DRV — EFSA Panel on Dietetic Products, Nutrition, and Allergies (NDA). Scientific Opinion on Dietary Reference Values for water. EFSA Journal. 2010;8(3):1459 [48 pp.]. Question No EFSA-Q-2008-464, adopted 4 December 2009.DOI: 10.2903/j.efsa.2010.1459
- [2]IOM 2004 DRI Water — Institute of Medicine (US) Panel on Dietary Reference Intakes for Electrolytes and Water. Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. Washington, DC: National Academies Press; 2005 (report released Feb 2004). Chapter 4: Water.
Last reviewed: 2026-06-20. Every figure on this page is sourced to the named primary references above.
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Frequently Asked Questions
What is the recommended daily fluid intake during pregnancy?
Europe's EFSA (2010) adds 300 ml/day to the non-pregnant adult-woman total-water Adequate Intake of 2.0 L/day, giving roughly 2.3 L/day during pregnancy. This is total water — all beverages plus the moisture in food — assuming moderate temperature and a physical-activity level of 1.6. Needs rise above this baseline with heat, exercise, or vomiting, so confirm your target with your provider.
How much extra water do I need when pregnant?
EFSA 2010 sets the pregnancy increment at +300 ml/day above the non-pregnant Adequate Intake for a woman of the same age. That moves the EFSA total-water target from 2.0 L/day to about 2.3 L/day. The figure assumes moderate environmental temperature and normal activity; hot weather, exercise, and morning sickness can push your actual needs higher.
Does food count toward my pregnancy hydration target?
Yes. Both EFSA (2010) and IOM (2004) define total water as drinking water plus all other beverages plus the moisture in food. In IOM's NHANES data for adults, beverages and drinking water supply about 81% of total water and food about 19%. So the ~2.3 L EFSA pregnancy target includes water from food — though most still comes from what you drink.
What are the best drinks for pregnancy hydration?
Plain water is the simplest way to reach the roughly 2.3 L/day EFSA pregnancy total-water target. Milk and other beverages also count toward total water under both EFSA and IOM definitions, and water-rich foods contribute the food-moisture share (~19% of total water in IOM data). Check caffeine and herbal-ingredient safety with your provider — the targets here describe fluid amounts, not ingredient safety.
Why do EFSA and IOM give different pregnancy water numbers?
The two authorities set different baselines. EFSA's 2010 Adequate Intake for adult women is 2.0 L/day, while IOM's 2004 value is 2.7 L/day. EFSA then adds 300 ml/day for pregnancy, reaching about 2.3 L/day. They use different methods and assumptions, so it is best to follow one framework consistently rather than combining the two figures.
How much water do I need when breastfeeding after pregnancy?
EFSA 2010 sets a larger increment for lactation than for pregnancy: +700 ml/day above the non-lactating total-water Adequate Intake for a woman of the same age. That is more than double the +300 ml/day pregnancy increment, reflecting the water lost in milk production. As always, this is a reference value, not a personal prescription — confirm with your provider.
Can I drink too much water during pregnancy?
The EFSA and IOM figures are total-water Adequate Intakes meant as targets, not minimums to exceed dramatically. Drinking far beyond your needs can rarely cause low blood sodium. This page covers reference fluid amounts only and is not medical advice — if you have kidney, heart, or pregnancy complications, ask your doctor or midwife how much fluid is right for you.
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