Newborns urinate yellow, the causes include physiological and pathological, pathological newborns urinate yellow may be due to neonatal jaundice, neonatal hepatitis, etc., should be promptly consulted to identify the cause. 1. physiological reasons: normal newborn urine is clear and transparent, can be light yellow, if the baby drink less water or sweating too much, can cause urine concentration, resulting in yellow urine, generally belong to the normal physiological phenomenon. 2. Pathological causes: (1) Neonatal jaundice: refers to the yellow coloration of the skin or other organs caused by the accumulation of bilirubin in the body, and it is the most common clinical symptom during the neonatal period. The first symptom of the child is yellowing of the skin and sclera. With the increase of bilirubin content, yellowing of urine, lethargy, depression, anorexia and other manifestations may appear. (2) Neonatal hepatitis: mostly caused by intrauterine infections due to viruses, commonly hepatitis B virus, cytomegalovirus, etc., which can cause damage to liver cells, leading to a decrease in the ability of hepatocytes to take in bilirubin, thus causing the symptom of yellowing of urine in newborns, and some of them may also be accompanied by fever and chills during the acute attack. Newborns with yellow urine, after excluding physiological factors, should be timely consultation, to clarify the cause of the disease and take appropriate treatment.