Eight-month-old babies yellow urine may be due to too little water, biliary obstruction and other reasons. 1. Drinking too little water: generally due to the hot weather, sweating increases, in the case of drinking less water and urine concentration, can also lead to the baby urine yellow, so in general need to pay attention to more water, moderation is good, do not drink too much. 2. Biliary obstruction: generally refers to the frequent and accompanied by yellow staining of the skin mucous membranes, sclera, biliary obstruction, there will be liver enlargement, bile stagnation, resulting in the baby’s yellow urine. Eight-month-old baby yellow urine may also be due to urinary tract infection, congenital choledochal cysts and other causes, the need to go to the hospital in time to seek medical attention, under the guidance of the doctor’s instructions for standardized treatment.