What causes a baby's urine to appear red?

In general, red urine in infants may be caused by food pigments, dehydration, urinary tract infections, glomerulonephritis, kidney stones, or other factors. If discomfort occurs, it is recommended to seek professional medical treatment under the guidance of a doctor. Specific analyses are as follows:

1. Food Pigments

Consuming certain foods rich in natural pigments—such as beets, carrots, and blackberries—may temporarily cause an infant's urine to appear red. Monitor the child's diet and reduce or avoid foods that cause changes in urine color.

2. Dehydration

When infants sweat heavily in hot weather or engage in vigorous activity without timely fluid replenishment, their urine may become concentrated, appearing dark yellow or even reddish. It is recommended to encourage the child to drink more water, especially during hot weather or after intense physical activity, to maintain adequate hydration.

3. Urinary Tract Infection (UTI)

When pathogens invade the urethra and cause a urinary tract infection, they may damage the urinary mucosa and lead to bleeding. Blood mixing with urine can result in red-colored urine. This condition is often accompanied by symptoms such as frequent urination, urgency, painful urination, and lower abdominal discomfort. Treatment under medical supervision may include medications such as cefaclor granules, amoxicillin granules, or ReLingQing capsules.

4. Glomerulonephritis

An abnormal immune response in infants may lead to glomerulonephritis, damaging the glomerular filtration membrane. This allows red blood cells to leak through the injured membrane into the urine, causing it to appear red. The condition may also present with symptoms including edema, hypertension, and proteinuria. Treatment under medical direction may include medications such as Bailing capsules, Haikun Shenxi capsules, or hydrochlorothiazide tablets.

5. Kidney Stones

Poor dietary habits in infants may contribute to the formation of kidney stones. As stones move within the kidney or down the urinary tract, they may irritate and damage the mucosal lining, causing bleeding. Blood entering the urine leads to a reddish appearance. Symptoms may include flank or abdominal pain and difficulty urinating. Under medical guidance, treatments may include herbal preparations such as Compound Desmodium Granules, Pishi Granules, or Shilintong Granules.

Parents are advised to help children maintain healthy lifestyle habits, follow regular sleep schedules, and avoid spicy or irritating foods, which may help alleviate symptoms.