What's wrong with the baby having diarrhea every time they drink breast milk?

Patient's question:

Symptom Description for Tianjin: Baby is over 40 days old. Pure breastfeeding. Whenever the baby eats breast milk, the stool is not good. The stool is watery and loose, and it leaks a little when passing gas. The baby cries during bowel movements. For two days, I was sick and stopped breastfeeding. The baby drank formula milk and had no diarrhea. But it might be that the formula milk is more irritating and causes some constipation. After starting breastfeeding again, the baby had diarrhea again. Why is this? Is there a problem with my milk? Or did the baby eat something it shouldn't have? The foods I have eaten in recent days are as follows: cabbage and lean meat dumplings soup (ate more meat dumplings, less cabbage, drank one bowl of soup), amaranth (almost didn't eat any), stir-fried tomatoes with eggs, pig trotters and soybean soup (only ate the lean meat and tendons of the pig trotters), winter...

Doctor's answer:

Babies rarely experience breast milk diarrhea, and it typically occurs only in a small number of infants under 6 months old. There are two main reasons for breast milk diarrhea. One is that the breast milk may contain a high level of prostaglandins, which can promote the movement of small intestinal smooth muscles, increase the secretion of water and electrolytes, and produce loose stools. The other reason is that the baby may be lactose intolerant.
If a mother notices that her baby has 3-7 bowel movements per day, with pale green, foamy, watery stools containing bubbles and curds, and a sour odor, sometimes with transparent, string-like mucus; the diarrhea occurs without fever, and the baby shows no obvious pain or crying, with no infections detected in the stool tests, and the diarrhea is mild with no other symptoms; the baby remains active and has a good appetite; although the diarrhea lasts for a long time, the weight gain is around 300 grams every 10 days—this is breast milk diarrhea.
Breast milk diarrhea is not a disease, but if it persists for a long time, it may lead to serious consequences such as growth stagnation and malnutrition, requiring timely treatment.

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