Watermelon is a safe and nutritious fruit during pregnancy, offering hydration, key vitamins, and relief from some of the most common pregnancy discomforts. At 92% water and relatively low in calories, it’s one of the more practical snacks for expectant mothers, especially during warmer months when dehydration risk climbs.
Key Nutrients for You and Your Baby
A one-cup serving of diced watermelon (about 152 grams) delivers roughly 14% of the daily value for vitamin C and 5% for provitamin A. It also provides about 4% of your daily B6 needs, along with magnesium and potassium. None of these numbers are extraordinary on their own, but they add up when watermelon becomes a regular part of your diet alongside other fruits and vegetables.
Vitamin C supports your immune system and helps your body absorb iron from plant-based foods, which matters during pregnancy when your blood volume increases significantly. Provitamin A plays a role in your baby’s developing vision. B6 is involved in brain and nervous system development, and some evidence suggests it can help reduce nausea. Magnesium and potassium help prevent the muscle cramps that become more common as pregnancy progresses.
Lycopene and Preeclampsia Risk
Watermelon is one of the richest food sources of lycopene, the pigment that gives it its red color. Lycopene is a powerful antioxidant, and there’s preliminary evidence linking it to lower preeclampsia risk. In a randomized controlled study of 251 first-time mothers published in the International Journal of Gynecology and Obstetrics, women who received lycopene supplements starting in their second trimester developed preeclampsia at roughly half the rate of those given a placebo (8.6% versus 17.7%). The lycopene group also had lower average diastolic blood pressure and higher average birth weights.
It’s worth noting that this study used concentrated lycopene supplements, not watermelon itself. You’d need to eat a large quantity of watermelon daily to match those doses. Still, the findings suggest that lycopene-rich foods may offer some protective benefit, and watermelon is an easy, enjoyable way to include more of it in your diet.
Relief From Morning Sickness and Heartburn
Many pregnant women report that watermelon is one of the few foods they can tolerate during bouts of nausea, particularly in the first trimester. The Mother Baby Center notes that some women find watermelon helps even when nothing else stays down. Its high water content, mild sweetness, and cool temperature make it easy on a sensitive stomach. There’s no single compound that explains this effect. It likely comes down to the combination of hydration, light flavor, and the fact that it doesn’t have the strong smell or heaviness that triggers nausea with other foods.
Watermelon can also ease heartburn, which becomes increasingly common in the second and third trimesters as your uterus presses against your stomach. Water-rich, non-acidic foods tend to be gentler on the digestive tract than citrus fruits or tomatoes.
Hydration and Swelling
Staying hydrated during pregnancy is critical. Your body needs more fluid to support increased blood volume, amniotic fluid, and the extra demands on your kidneys. Dehydration can trigger contractions, headaches, and fatigue. Watermelon’s 92% water content makes it a practical supplement to your daily fluid intake, not a replacement for drinking water, but a meaningful addition. If you’re struggling to drink enough, eating watermelon is an effective way to close the gap.
Swelling in the feet, ankles, and hands affects most pregnant women, especially in the third trimester. While no single food eliminates edema, watermelon’s combination of water and natural electrolytes can help your body manage fluid balance more effectively than sugary drinks or processed snacks.
Sugar Content and Gestational Diabetes
Watermelon has a high glycemic index of 80, which can sound alarming if you’re watching your blood sugar. But glycemic index only tells you how fast a food raises blood sugar, not how much. Glycemic load, which accounts for the actual amount of carbohydrate in a typical serving, is a better measure. Watermelon’s glycemic load is just 5, which Harvard Health classifies as low. That’s because a cup of watermelon contains relatively little carbohydrate despite being sweet.
If you have gestational diabetes, watermelon isn’t off-limits, but portion control matters. One cup at a time is a reasonable serving, and pairing it with a source of protein or healthy fat (like a handful of nuts) can slow the blood sugar response further. Eating three or four cups in one sitting is a different story, so keep servings moderate and spread them out.
Food Safety Tips
The main safety concern with watermelon during pregnancy isn’t the fruit itself. It’s how the fruit is handled. Bacteria, including listeria, can live on the outer rind and transfer to the flesh when you cut through it. The FDA recommends thoroughly rinsing whole melons under running water before cutting, even though you don’t eat the rind. Once bacteria are on the knife or cutting surface, they spread to every slice.
Pre-cut watermelon from grocery store displays or salad bars carries a higher risk because it’s been sitting at variable temperatures after being handled by others. Buying a whole watermelon and cutting it yourself at home is the safer choice. If you do buy pre-cut, refrigerate it immediately and eat it within a day or two. Any watermelon that’s been sitting at room temperature for more than two hours should be discarded.
How Much to Eat
There’s no official recommended limit for watermelon during pregnancy, but one to two cups per day is a sensible target for most women. That gives you meaningful hydration and nutrients without excessive sugar intake. Eating significantly more than that in one sitting can cause bloating or digestive discomfort, which is already a common pregnancy complaint. If you have gestational diabetes or have been told to monitor your carbohydrate intake, stick to one cup per serving and check how your blood sugar responds.