6-month-old babies urinate less, which may be caused by eating less, sweating more, or suffering from urinary system diseases. 1. 6-month-old babies who do not eat enough milk, water, or because of high ambient temperatures lead to increased sweating, the baby will appear to reduce the amount of urine phenomenon, timely rehydration, the phenomenon of low urine will improve on its own. 2. If the baby suffers from urinary system diseases, such as nephrotic syndrome, renal insufficiency, etc., the baby will appear urine, swelling and other symptoms. 6-month-old baby urine, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.