Welcome to HealthCare Magic
I hope you are doing good , i can understand your concern. you did not mentioned has age , how many times did he vomit any fever or loose motion
. If he vomited one just give him
If you did notice any blood in has vomiting
or in stool that can be concerning but if you saw something else that not a concern. Usually children do vomit it could be gastroenteritis
. You should give a visit to your Pediatrician
he will give you details after examining and taking the detail history of current issue.
I hope have answered your query. feel free to ask
Wish your son good health.