What causes a 10-day-old baby to have yellow watery stools?

A 10-day-old baby passing yellow watery stools may be caused by indigestion, lactose intolerance, or acute gastroenteritis.

1. Indigestion

The organs of a 10-day-old baby are still underdeveloped, and gastrointestinal function is generally immature. Excessive feeding, overly frequent feeding, or a cold abdomen may lead to indigestion, resulting in yellow watery stools.

2. Lactose Intolerance

A 10-day-old baby with lactose intolerance typically cannot properly break down or absorb the lactose in milk. This may cause abdominal pain, bloating, or diarrhea, leading to symptoms such as yellow, watery, or mushy stools.

3. Acute Gastroenteritis

A 10-day-old baby has a relatively weak immune system. If the intestines become infected with bacteria or viruses, acute gastroenteritis may develop, causing symptoms such as vomiting, diarrhea, and abdominal pain. Severe diarrhea may result in the passage of yellow watery stools.

If a 10-day-old baby passes yellow watery stools, prompt medical evaluation at a hospital is recommended to prevent disturbances in fluid, electrolyte, and acid-base balance.