It is usually okay to eat watermelon in small amounts when your baby has a fever. First of all, the water content in watermelon is relatively high. When you have a fever, your body will lose more water, so eating more watermelon can replenish the water lost in your body. Secondly, the energy content in watermelon is also relatively high. When you have a fever, the consumption of the body is relatively large, eat more watermelon can replenish energy. Secondly, watermelon has the function of diuretic, which can help the baby to expel the toxins in the body, so you can eat a small amount of watermelon during the fever. But watermelon is not able to eat more, watermelon is relatively cool, belongs to a kind of cool fruit, easy to cause diarrhea, that is, acute gastroenteritis. If eating too much watermelon causes diarrhea, it may aggravate the child’s fever. If the fever is caused by gastrointestinal diseases, often with vomiting, nausea, abdominal pain, diarrhea, also can not eat watermelon.