Distinguishing Physiological Diarrhea from Lactose Intolerance in Infants
Aug 11, 2022
Source: Cainiu Health
Dr. Chen Zhe
Introduction
The distinction between physiological diarrhea and lactose intolerance in infants lies in the characteristics of their stools. Infantile diarrhea encompasses both infectious and non-infectious types. Non-infectious diarrhea further includes lactose intolerance–related diarrhea. Other common causes of non-infectious diarrhea include cold-induced abdominal discomfort and indigestion. Stools in these cases are often loose and may have a fishy odor along with an acidic, undigested smell.
Some infants develop diarrhea and lactose intolerance due to various factors, causing considerable confusion and concern among parents. However, many are unsure of the differences between physiological infantile diarrhea and lactose intolerance. What exactly distinguishes physiological infantile diarrhea from lactose intolerance?
Differences Between Physiological Infantile Diarrhea and Lactose Intolerance
The key distinction lies in stool characteristics. Infantile diarrhea falls into two broad categories: infectious and non-infectious. Non-infectious diarrhea includes lactose intolerance–related diarrhea, as well as diarrhea caused by abdominal cold exposure or indigestion. Stools associated with these latter causes tend to be loose and may have a fishy odor or an acidic, sour smell indicative of poor digestion. In contrast, stools from lactose intolerance exhibit more distinctive features: after breastfeeding or formula feeding, the infant’s abdomen often produces gurgling sounds, followed by watery, frothy stools.
Physiological infantile diarrhea is a relatively common physiological phenomenon in young children, most frequently observed in infants around six months of age. The primary cause is immature gastrointestinal function—when fed, their digestive system cannot adequately handle the intake, resulting in symptoms such as diarrhea. This condition is considered a normal physiological variation; it does not impair growth and development or appetite, and typically requires no pharmacological treatment.
When an infant experiences physiological diarrhea, certain dietary adjustments may help alleviate symptoms. For example, introducing appropriate complementary foods—such as rice cereal, rice porridge, rice water, or plain biscuits—can be beneficial. In most cases, diarrhea gradually improves once suitable complementary foods are timely introduced. We hope this information proves helpful!
