What should I do if my baby's stool has foam?

Patient's question:

Baby has been born for more than two months, breastfed, and recently found that his stool has foam, with a foul smell, and his farts are also foul (originally he also farted frequently, without a foul smell from morning to night). What could be the reason? How to solve it? Thank you!

Doctor's answer:

Infants may first consider physiological diarrhea, which is similar to foamy diarrhea. No special treatment is required. This is because breast milk contains more lactose, while infants lack lactase and are lactose intolerant. Most lactose is broken down by lactase. After producing acid in the skin and intestines, gas stimulates the intestines, causing feces to be expelled as diarrhea-like, foamy stools. Generally, as infants grow and develop, lactase gradually matures, and enzyme activity increases. This allows for the gradual breakdown, digestion, and absorption of lactose. Additionally, as complementary foods are introduced, the condition will gradually improve.

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