Why does a newborn pass stool but not urinate?

Under normal circumstances, defecation refers to bowel movement, and urination refers to passing urine. If a newborn passes stool but does not urinate, it may be related to factors such as immature kidney function in newborns, low intake volume, glomerulonephritis, urinary tract obstruction, or neurogenic bladder. If any discomfort occurs, timely medical consultation is recommended for symptomatic treatment under a doctor's guidance. Specific analyses are as follows:

1. Immature Kidney Function in Newborns

The kidneys of newborns are still developing after birth. In the early stages, they may not adequately process waste and fluids in the body, resulting in longer intervals between urinations and causing passage of stool without urine. Usually, no specific treatment is required. As the newborn grows and develops, kidney function gradually matures, and urination will naturally improve.

2. Low Intake Volume in Newborns

If a newborn consumes a small amount of milk, the corresponding water intake also decreases, which can affect urine production and excretion. Since available fluids may be primarily used to soften intestinal feces, this could lead to stool passage without urination. Increasing feeding volume and ensuring adequate hydration and nutrition can help promote normal urine output.

3. Glomerulonephritis

Glomerulonephritis may be associated with genetic, infectious, immune, or metabolic factors. It can impair the filtration and reabsorption functions of the newborn’s kidneys, leading to reduced or absent urine production, thus causing passage of stool without urine. Symptoms may also include edema, hematuria (blood in urine), and proteinuria (protein in urine). Under medical guidance, medications such as Bailing Capsules, Haikun Shenxi Capsules, or Hydrochlorothiazide Tablets may be used to alleviate symptoms.

4. Urinary Tract Obstruction

Urinary tract obstruction may result from congenital abnormalities, such as ureteral valves or bladder neck obstruction, which block urine outflow and cause stool passage without urination. Symptoms may include abdominal distension, pain, and vomiting. Surgical intervention may be necessary, such as ureterotomy or valve resection, to relieve the obstruction and restore normal urine flow.

5. Neurogenic Bladder

Neurogenic bladder may arise from spinal cord injury, abnormal brain development, or other neurological issues, leading to impaired bladder emptying. This may result in a newborn passing stool but not urinating. Additional symptoms may include urinary incontinence, urinary retention, and urinary tract infections. Under medical advice, surgical treatments such as urethral dilation or cystostomy may be performed to improve urine drainage.

Parents are advised to closely monitor their newborn’s physical condition, ensure timely fluid intake, and practice scientific feeding to help alleviate symptoms.