The most common reason for leg cramps in the fourth month of pregnancy is calcium deficiency, during which the fetal growth rate is accelerated and the calcium content is higher. The symptoms of leg cramps can also occur after being exposed to moisture or cold, so you should pay attention to keeping warm during this period, and you should also take calcium supplements in time. You should also eat more food with high calcium content, you can eat more seafood or drink milk in moderation, milk is also very high in calcium content, you can also drink bone broth in moderation for calcium, usually need to pay attention to more sunshine to promote the absorption of calcium.