During pregnancy, experts recommend 8 to 12 cups (64 to 96 ounces) of water daily to support amniotic fluid, digestion, and overall maternal health.
You probably know the standard advice to drink eight glasses of water a day. What many people don’t realize is that pregnancy changes that number. Your blood volume expands by roughly 50 percent, and your body needs extra fluid to build amniotic fluid and support the placenta. That old eight-glass rule doesn’t cover it.
Health experts recommend 8 to 12 cups of water each day during pregnancy — about 64 to 96 ounces. This range is meaningfully higher than the general adult target of roughly 8 cups, and for good reason. This article covers the specific guidelines, why water matters more right now, and how to tell if you’re getting enough.
How Pregnancy Changes Your Fluid Needs
During pregnancy your blood volume expands by nearly 50 percent. That extra fluid has to come from somewhere, and water is the primary source. Your body also uses water to build and maintain amniotic fluid, which cushions the developing baby throughout pregnancy.
The placenta, which delivers oxygen and nutrients, depends on consistent hydration too. A 2023 study in PMC noted that hydration status during pregnancy is associated with pregnancy outcomes. When intake dips, those systems can’t work as efficiently.
A simple way to frame it: your body is building and supporting another human. That process increases your need for nearly everything — calories, certain nutrients, and yes, water. The recommended intake rises to match this real physiological demand.
Why Hydration Matters More Now
Beyond quenching thirst, water plays several specific roles during pregnancy that make the higher target worthwhile. These functions overlap, which is why a single target matters more than it does outside pregnancy.
- Amniotic fluid formation: Water makes up most of the amniotic fluid. Consistent intake helps maintain healthy fluid volume around your baby throughout pregnancy.
- Digestion and constipation relief: Pregnancy hormones slow digestion, and adequate water may help prevent or ease common issues like constipation and hemorrhoids.
- Nutrient delivery: Water carries nutrients through your bloodstream to the placenta and then to your baby, supporting steady growth and development.
- Temperature regulation: Your body works harder during pregnancy and generates more heat. Water helps regulate body temperature and prevent overheating.
- Urinary tract health: Drinking enough water flushes bacteria from your urinary tract, which may help lower the risk of UTIs — a frequent concern in pregnancy.
The ACOG notes that water aids digestion and helps form the amniotic fluid, making consistent intake a simple but important part of prenatal care. Each sip contributes to multiple systems at once.
How Much Water to Drink Each Day
The most widely cited guideline comes from the American College of Obstetricians and Gynecologists (ACOG), which recommends 8 to 12 cups (64 to 96 ounces) of water daily during pregnancy. That equates to roughly 1.9 to 2.8 liters of fluid from beverages alone.
A 2024 study in PMC suggests a slightly higher figure — 3.0 liters of total water per day, including water from food and other beverages. The beverage-only portion comes to about 2.3 liters, or approximately 10 cups. A 2024 Penn State report found that many pregnant women don’t reach even the lower end of these targets — the national guidelines range highlights the gap between recommended and actual intake.
Some clinicians suggest adding roughly 8 ounces of water per trimester as a practical rule of thumb. If you exercise, adding one extra cup for every 30 minutes of activity can help cover fluid loss from sweat. These estimates give you a ballpark to work from.
| Source | Daily Recommendation | Notes |
|---|---|---|
| ACOG | 8–12 cups (64–96 oz) | Standard pregnancy guideline; beverage-focused |
| 2024 PMC Study | ~10 cups (80 oz) beverages; 3.0 L total | Includes water from food sources |
| General Adult (non-pregnant) | ~8 cups (64 oz) | Lower baseline; pregnancy increases need |
| UK Tommy’s / NHS | 6–8 medium glasses (~1.6 L) | Smaller glasses; all fluids count |
| National Guidelines (Penn State) | 1.9–3.0 L total | Range from research analysis of existing data |
These numbers may look different at first glance, but they converge on a similar target — roughly 8 to 12 cups of fluids per day. Water is the best choice, though other beverages contribute to your total. The key is finding a pattern that fits your daily routine.
Signs You Might Not Be Drinking Enough
How do you know if you’re hitting the mark? Your body gives several clear signals, and paying attention can help you catch a shortfall early.
- Dark urine: Pale yellow or clear urine typically indicates good hydration. Dark yellow or amber urine is a common sign you need more fluids throughout the day.
- Persistent thirst: If you feel thirsty often, you’re likely already behind on intake. By the time thirst registers, mild dehydration may have set in.
- Dry mouth or chapped lips: Dryness in your mouth, less saliva than usual, or persistent lip chapping can point to low fluid levels that need attention.
- Fatigue or lightheadedness: Dehydration can contribute to low blood pressure, which may leave you feeling dizzy, tired, or faint — especially when standing up quickly.
- Infrequent urination: If you’re going to the bathroom much less often than usual, or your urine volume seems low, that’s a reliable sign to drink more.
Mild dehydration during pregnancy is common and usually easy to correct. Keeping a water bottle nearby, setting a loose schedule, and checking your urine color once or twice a day can help you stay ahead of thirst.
Easy Ways to Meet Your Hydration Goal
Hitting 8 to 12 cups doesn’t have to feel like a chore. Per the ACOG water recommendation, spreading your intake across the day makes the target manageable without feeling overly full. Sip regularly rather than gulping large amounts at once.
Keep a water bottle with you and refill it throughout the day. A 24-ounce bottle filled four times gets you to 96 ounces — the top of the range. If that feels like a lot, start with a smaller bottle and refill it more often. Adding a squeeze of lemon, lime, or cucumber can make plain water more appealing.
Other fluids count toward your total — milk, herbal tea, juice, and even caffeinated drinks in moderation all contribute. The UK charity Tommy’s notes that all drinks count toward your fluid goal, though water is the best choice. Sugary beverages carry empty calories and should be limited. A simple daily habit — a glass of water with each meal and a bottle between meals — covers most of the target without extra effort.
| Check-in | Well-Hydrated | Needs More Fluid |
|---|---|---|
| Urine color | Pale yellow | Dark yellow or amber |
| Thirst | Rarely thirsty | Often thirsty |
| Bathroom visits | Every 2–4 hours | Infrequent or low volume |
The Bottom Line
Drinking 8 to 12 cups of water daily during pregnancy supports your body’s increased blood volume, amniotic fluid levels, and overall function. The target is higher than the standard adult recommendation, but most people can meet it by sipping water consistently throughout the day and paying attention to thirst and urine cues.
Your obstetrician or midwife can help adjust this target based on your specific health needs — especially if you have conditions like gestational diabetes, a history of preterm labor, or swelling that affects how your body handles fluids. Your prenatal care team knows the full picture and can tailor the number to your situation.
References & Sources
- Psu. “Pregnant Women May Not Be Drinking Enough Water Researchers” National guidelines recommend pregnant women consume between 1.9 and three liters of water every day, according to Penn State University reporting on the research.
- ACOG. “How Much Water Should I Drink During Pregnancy” The American College of Obstetricians and Gynecologists (ACOG) recommends pregnant women drink 8 to 12 cups (64 to 96 ounces) of water every day.