What is the reason for vomiting after vaccination in a 7-month-old baby?

Patient's question:

On the 7th, I took him to get vaccinated. The doctor gave him a sugar pill to eat, and after finishing it, he vomited milk. He has been vomiting milk for the next few days. I don't know what the reason is, whether it was triggered by the vaccination or if he has a slight fever. Today, I gave him a little cold medicine and kept checking his temperature, which is normal. The baby also doesn't drink milk well, only eating a few mouthfuls and then stopping. I'm very worried. Please help me!
Previous treatment history and effectiveness: He didn't have this reaction during previous vaccinations!
The kind of help I need: I hope the doctor can help me!

Doctor's answer:

For infants who vomit a very small amount of milk shortly after being fed, generally in good condition, with normal appetite, without crying or fussing after vomiting, and without any other symptoms or signs, it is commonly referred to as "spit-up" and is considered a normal phenomenon.
Advice: If there is dry heaving, occurring several times a day, gradually becoming more frequent and expanding into projectile vomiting, followed by intense dry heaving about half an hour after each bowel movement, with vomit volume sometimes exceeding intake, and the vomit containing no (bile), while appetite remains normal, and the infant gradually loses weight due to prolonged dry heaving, it may be a case of congenital hypertrophic pyloric stenosis. Please seek further evaluation.
Doctor's inquiry: undefined
The above advice is for the question "4-month-old baby vomiting after vaccination." It is hoped to be helpful to you. Wishing you good health!

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