During gestational diabetes, white blood cells have various functional defects, reduced chemotaxis, phagocytic action, and bactericidal activity. This can easily lead to infections during pregnancy or childbirth, and even develop into sepsis, often caused by bacteria or fungi. Therefore, when blood sugar is not controlled in gestational diabetes, there may be symptoms like vulvar itching, or even infections of the urinary or reproductive systems. If the infection is not further treated, it may cause preterm birth, or even septic shock. Therefore, in gestational diabetes, it is crucial to actively control blood sugar and prevent infections.