What is the reason why a baby vomits after eating after getting a vaccine?

Patient's question:

What is the reason for a six-month-old baby vomiting after receiving a vaccine and eating anything? Mild fever, vomiting. What help is needed: What is causing it, what should be done?

Doctor's answer:

The child vomits everything they eat, except for a slight fever, which makes acute gastritis highly likely. The reappearance after vaccination is likely just a coincidence, as the baby received the hepatitis B vaccine at six months old and would never have this kind of adverse reaction again. It is recommended to fast for a period of four to six hours, and absolutely no medication should be taken. The purpose is to allow the stomach to rest fully and aid in complete recovery.

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