What should I do if my child's diarrhea doesn't improve with medication or intravenous fluids?

Patient's question:

Over a month
Duration of this illness and its persistence: A dozen days
Detailed condition and purpose of consultation: My baby might have caught a cold in his lower abdomen on the first day. After the symptoms slightly improved, the adults carelessly gave him a few grapes. Then, he had non-stop diarrhea for half a month. During this period, his mental state was okay, but he felt weak in his legs. He went to the hospital, where the doctor tested his stool and found no virus. He took Peefikang, Montmorillonite Powder, then increased the dosage of Jianwei Xiaoshi Oral Liquid and Xi Xin, and was given intravenous saline for two days. He also applied an umbilical patch, but there was no improvement, and it even worsened. Please ask 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 very 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 supplementation is also necessary, along with small, frequent meals. If needed, probiotics like Bifidus and Hegen 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 cephalaxin granules can be given to the baby. 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 ensure moderate warmth, with special attention to keeping the abdomen warm.
If the baby's room is dry, several bowls of water can be placed inside, or a humidifier can be added.