Why do infants and young children often vomit

Patient's question:

The baby often vomits. Whenever she cries and coughs, she vomits. She also vomits if she plays too hard or eats too much. I don't know if it's a problem with her stomach. Children of the same age usually eat more than one bowl, but my daughter only eats one bowl if she remains very calm and doesn't make a fuss. If she cries or coughs, she is guaranteed to vomit. What should I do?
Past medical treatment and effectiveness:
No medical treatment has been administered.
Desired assistance:
I want to see if there is a problem with her stomach or if my daughter needs to increase her food intake because her stomach is small.
Why does she vomit every time she coughs?

Doctor's answer:

Nausea in children is a pathological phenomenon, commonly seen in acute enteritis, gastritis, pyloric spasm, hypertrophy, stenosis, pneumonia, meningitis, and other diseases. Its main characteristics include concurrent nausea, increased abdominal pressure, frequent vomiting of milk, a large amount of dry retching, often containing milk curds and stomach contents, and even mixed with green bile. Sometimes, the dry retching appears as if spitting. Due to the underlying disease, the child often exhibits a painful expression and cries incessantly during vomiting. When parents notice dry retching symptoms in their child, they must pay close attention and seek medical attention promptly.

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