How to Handle a Three-and-a-Half-Month-Old Baby Who Frequently Has Foamy, Thin Stool?

A three-and-a-half-month-old baby frequently passes foamy, thin stools. After taking Simeticon and Yigan San, the symptoms temporarily alleviate, but return after stopping the medication. It’s been said that methods like Mommy Love and boiled apple water are ineffective, and there’s hesitation to give the Four Grind Soup due to concerns about its ineffectiveness. What could be the issue? How can it be improved?
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