This morning my son vomit after he finish his milk and afternoon he vomit again and just now 6 pm he vomit again after his milk? I check his temperature 37.6 , what should I do? Should I bring him to see doctor?

Monitor him for a day. Try to cut down the amount of milk and see if he is able to take it down. Most importantly he needs to be kept hydrated. In cases of vomiting and diarrhea, dehydration is the main concern. If more vomiting comes up throughout the night, or more symptoms start appearing it would be advisable to bring him to the doctors.