What are some good treatments for infant diarrhea?

Patient's question:

Two-month-old baby with diarrhea, yellow stool, excessive moisture, sour odor, and frequent bowel movements, but no WBC, RBC, or fat droplets were found in the stool. There were curds, and sometimes the stool had no solid content, just yellow liquid. Can Baby's One-Stop Relief be used?
Additional question: The baby often spits up milk, sometimes vomiting after a nap when held. The vomit is like cottage cheese. Is this related to the diarrhea? The baby is exclusively breastfed. What should the mother's diet focus on?

Doctor's answer:

Diarrhea is the most common digestive disorder in infants and young children. At this stage, babies are in the transition period of diet, making them more prone to diarrhea. Some babies switch from exclusive breastfeeding to mixed feeding, while others start adding complementary foods. Some babies are weaned due to their mothers returning to work. These changes can lead to gastrointestinal adaptation and adjustment in babies, potentially resulting in physiological diarrhea.
Physiological diarrhea is not a disease. Its symptoms include: no more than 8 bowel movements per day, each with a small amount; although not well-formed, the stool contains little moisture; no special odor, but may include green stools and curds; the baby is in good spirits, feeding normally, without fever, abdominal distension, or abdominal pain.
If it is physiological diarrhea, do not give the baby any medication indiscriminately, especially antibiotics, as this can disrupt the gut microbiota and lead to illness.
The approach to physiological diarrhea is as follows: if it is caused by switching from breast milk to formula milk, you can reduce the amount of formula milk, add appropriate amounts of rice cereal, or switch to a different formula milk; if it is caused by adding complementary foods, you can reduce the amount of complementary foods or temporarily stop adding them; some babies may experience physiological diarrhea after taking fish oil, in which case it is also necessary to temporarily stop taking it.