1. Why does a four-month-old baby have diarrhea? At about four months, the baby\’s intestinal function begins to mature, but it is still relatively fragile. Therefore, babies are prone to diarrhea due to interference from various factors. Common causes include infection with viruses, bacteria or parasites, improper eating, allergic reactions, etc. 2. How to judge whether a four-month-old baby has diarrhea? 1. Observe the frequency and characteristics of defecation: Under normal circumstances, a four-month-old baby defecates 1-2 times a day. The feces is yellow or brown and has a moderately soft and hard texture. If defecation times