My 3yr old son has been throwing up for the past 5 hours. He threw up food at first then yellowish orange and now dark brown muscus the past 6 times, is this something serious or just because he has an empty stomach. He doesn t have a fever and he s doesnt seem to be in pain just very tired.
Your child is showing symptoms of deny Chat Doctor.  This much vomiting can lead to biochemical abnormalities that require IV fluids and can be the result of something as innocent as a viral infection to something more serious causing intestinal obstruction.  I recommend you consider this as serious and take him a doctor tonight to be on the safe side as he is small and becoming weak.