What causes yellow urine in infants?

Aug 15, 2025 Source: Cainiu Health

Dr. Zhou Xiaofeng

Introduction

Bacterial invasion of an infant's urinary tract causes infection, leading to increased bacteria and inflammatory secretions in the urine, resulting in yellowish urine. This condition is often accompanied by symptoms such as crying during urination, frequent urination, fever, and refusal to breastfeed. Doctors may prescribe medications such as Cefaclor for oral suspension, Amoxicillin and Clavulanate Potassium for oral suspension, and Furazolidone tablets. If any abnormalities occur, prompt medical attention is recommended.

Infant urine may appear yellow due to insufficient water intake, dietary factors, urinary tract infections, neonatal jaundice, biliary atresia, and other causes. If abnormalities are observed, timely medical consultation is recommended. Detailed analysis is as follows:

1. Insufficient fluid intake: If an infant consumes inadequate breast milk or additional water, urine may become concentrated, increasing pigment concentration and causing yellow urine. It is recommended to appropriately increase feeding frequency or supplement with warm water according to the infant's age to ensure sufficient fluid intake.

2. Dietary factors: Infants who are breastfed may develop yellow urine if the mother consumes excessive carotenoid-rich foods such as carrots and pumpkin, or if formula milk is overly concentrated. Mothers should adjust their diet, and formula milk should be correctly diluted according to recommended proportions to avoid excessive concentration.

3. Urinary tract infection: Bacterial invasion of the infant's urinary tract can cause infection, increasing bacterial and inflammatory secretions in the urine, resulting in yellow urine. Symptoms often include crying during urination, frequent urination, fever, and refusal to feed. Doctors may prescribe medications such as cefaclor dry suspension, amoxicillin-clavulanate potassium dry suspension, or furazolidone tablets.

4. Neonatal jaundice: Incomplete liver function in newborns can lead to abnormal bilirubin metabolism, with excess bilirubin excreted through urine, causing yellow urine. Symptoms often include yellowing of the skin and sclera, drowsiness, and reduced milk intake. Doctors generally recommend phototherapy with blue light treatment.

5. Biliary atresia: Abnormal bile duct development can obstruct bile excretion, causing bilirubin to reflux into the bloodstream and be excreted through urine, resulting in dark yellow urine. Symptoms often include pale stools. Doctors may prescribe medications such as ursodeoxycholic acid capsules, cefoperazone sodium and sulbactam sodium for injection, and compound glycyrrhizin injection according to the condition. Most affected infants require surgical treatment.

In daily life, maintain infant perineal hygiene, change diapers frequently, and prevent urinary tract infections. Monitor urine volume and color changes during feeding, and schedule regular health check-ups. If yellow urine persists or is accompanied by other abnormal symptoms, seek timely medical evaluation and treatment.

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