During pregnancy, some pregnant women found that their urine was yellow when urinating, and they were nervous during the prenatal examination. They would ask the doctor if there was any danger. Yellowing of the urine of pregnant women during pregnancy is very common. The most common reason is that they drink too little water. Drinking too little water will result in less urination, and the solubility of uric acid and urea in the urine will be relatively high, which will make the urine appear yellow. In this case, it is mainly to dilute the urine by drinking more water, so that the urine will become clearer. However, if the urine is still clear after drinking water, we should pay attention to it. We should check the urine routine to see if the indicators in the urine routine are abnormal. If the routine urine test is abnormal, the renal function should be monitored to determine whether there is a disease of the urinary system.