What should I do if a two-year-old baby vomits and has diarrhea but no fever?

Patient's question:

A two-year-old baby has been dry heaving for four days. On the third day of dry heaving, they started having diarrhea. On the third day, they had four bowel movements, which were very watery, like water. Now it's a bit better, but they had one bowel movement today, which was still very watery. They usually vomit once a day. The hospital tests showed normal stool, and they don't have a high fever. In the morning, they are still in good spirits and have a good appetite, but in the afternoon, they feel worse, are a bit fussy, and have a poor appetite. They go through periods of being fussy and then calm. It seems like they might have a stomachache.
Previous Treatment and Effects:
They were given Mamia and Smecta.
What kind of help is needed:
The vet at the pet hospital said it was a stomach fever, but they don't have a high fever. I want to ask: Is this really stomach fever? Can they take Ribavirin?

Doctor's answer:

To ensure children eat well, it's also important to pay attention to the methods. Some children have picky eating habits, and parents become anxious. To coax them into eating dinner, some parents use toys to distract their children during meals, while others let them play while eating... Excessive indulgence by parents and a lack of understanding of proper feeding methods are also direct causes of children's picky eating.
Guidance: Create a relatively quiet environment for the child to use the restroom so that they can relieve themselves comfortably and happily. The digestive system is affected by emotions; stress can reduce appetite. Therefore, when the child is using the restroom, adults should avoid loud laughter or chatter, and absolutely refrain from teasing or urging them to do this or that.

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