Normal four-month-old baby’s urine should be clear and yellowish, if the baby’s urine becomes more yellow, pay attention to the following problems: first of all, it may be hot weather, baby drink less water or sweat more, urine concentration leads to deepening color, this situation can give the baby appropriate feeding some water, the baby drink milk soak thinner, so the baby can take in more water, the color of urine will become lighter. Secondly, we should pay attention to whether the baby has underlying diseases, especially liver and biliary diseases, if the baby’s skin sclera yellow stain, to the pediatric gastroenterology clinic, examination, urine routine, liver function, to see the specific circumstances of the increased bilirubin, as far as possible to find the cause, the cause of treatment is the focus.