Childhood diarrhea, taking medicine, and intravenous infusion are not effective. What should I do?

Patient's question:

Over a month
Duration of this illness: A dozen days
Detailed condition and consultation purpose: My baby might have caught a cold in his lower abdomen on the first day. After the symptoms slightly improved, the adults gave him a few grapes without realizing it. Then, he had continuous diarrhea for half a month. During this time, his mental state was okay, but his legs felt weak. He went to the hospital, where the doctor tested his stool and found no virus. He took Peefikang, Montmorillonite, Jianwei Xiaoshi Koufuye, Xi Xin, and received intravenous saline for two days. He also applied umbilical patches, but there was no improvement, and it even got worse. I would like to ask all the experts, do you have any good suggestions?

Doctor's answer:

Diarrhea in infants and young children is the most common gastrointestinal disease. The fundamental cause of diarrhea in babies is poor immune function and weak resistance to viruses and bacteria. When the intestines are infected, it is easy for them to develop diarrhea. Additionally, overfeeding, which leads to indigestion, can also cause diarrhea in babies. Allergies and colds can also be accompanied by diarrhea symptoms.
During acute diarrhea, it is appropriate to temporarily withhold food for a short period, generally not exceeding 8 hours. Adequate fluid replacement is also necessary, along with small, frequent meals. If needed, probiotics like Bifidus and Hefengyuan can be given to the baby, which are effective.
At night, when the baby is sleeping, slightly elevating the head of the bed can help ensure smooth breathing and better rest. Most cases of colds, fever, and sore throats in babies are caused by exposure to cold. It is important to encourage the baby to drink plenty of plain water, vegetable juice, and fruit juice. If necessary, oral cephradine granules can be administered. Additionally, the temperature, humidity, and air quality in the baby's room should be appropriate. The baby's clothing and bedding should be adjusted to maintain moderate warmth, with special attention to keeping the abdomen warm.
If the baby's room is dry, several bowls of water can be placed in the room, or a humidifier can be added.