Very often Vomiting in Children

Patient: My son is 2yr. 5 months.he throws up food very often from his mouth and his nose. this has been there since his childhood.its not an allergy as i feed him same food that he vomits .in less than 5 to 10 minutes and he eats even more than before withtout throwing up again.he cann’t drink milk or water fast as he vomits.what can be the possible reasons ? and what is the name of the illness or disease if any?

Doctor: