There are many reasons for yellowing of urine in infants, such as insufficient water intake, physiological jaundice, etc., which need to be analyzed according to the specific situation. 1. Lack of water in the body: insufficient water intake in infants may lead to concentration of urine, increased concentration of metabolic waste products, and yellowing of urine. This situation should be given to the infant to replenish sufficient water, usually can be effectively relieved. 2. Physiological jaundice: most babies have jaundice at birth, and jaundice may lead to increased bilirubin levels in the urine, and bilirubin dissolved in the urine will appear dark yellow, so jaundice may also lead to yellowing of the urine of infants. Jaundice in infants is mostly physiologic and usually does not require special treatment; regular bilirubin checks are sufficient. If your baby’s urine is yellow and doesn’t go away, you should consult a doctor to find out the cause of the problem and then treat it to avoid delaying the condition.