Baby is 7 months old and has been having diarrhea. How should it be treated? What medicine should be taken?

Patient's question:

Okay, here is the translation, following your instructions:
Okay, I have been having diarrhea for a while. Initially, it was yellow water with curds and froth. I gave him Bizi all day, Montmorillonite powder, and Xiao'er Yangpi Granules. It's been a week, but there's still no improvement. He has 8 or 9 episodes a day, but his (spiritual state / condition) is okay. Could you please tell me how the doctor should treat him? What medicine does he need? Urgent, urgent, urgent! Thank you.
Medical history and effectiveness:
Initially, when the diarrhea started, I gave him Bizi to drink for a whole day, but it didn't improve.
Help needed:
Now the diarrhea is a bit sticky. He has more episodes between 4 or 5 AM. I want to ask the doctor, how should he be treated now? What medicine is good? Urgent for a reply. (Thank you doctor for quickly answering – how should it be treated and prevented.)

Doctor's answer:

Children under one year old have not yet improved their gastrointestinal function, and their intestines lack lactic acid bacteria, which may lead to constipation, nausea and vomiting, or abdominal pain. However, if this has only recently occurred, and if the child's stool is watery or resembles egg drop soup, with a large volume and frequent bowel movements, accompanied by dry retching or fever, considering the current season, it could be autumnal nausea and vomiting, which suggests a high likelihood of rotavirus-induced nausea and vomiting. Probiotics can be given to regulate the gastrointestinal tract, and a stool test should be conducted at the hospital to check for contagious conditions. If it is rotavirus enteritis, as long as there is no dehydration, it is self-limiting. If there is a bacterial infection, antibiotics should be administered.

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