<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 3 year old just got the g-j tube put in on Monday. He only takes 1 medicine through the g-tube and everything else is through the j tube. He has been feverish and last night he was up and down all night. He eventually threw up dark brown liquid. Can you please tell me what to do?  <response>: As such dark brown vomits could indicate presence of altered blood which could be a cause of concern. It could mean bleeding somewhere in the gastrointestinal tract. It is hard to comment on the treatment without knowing the specific reasons for the gastro-jejunostomy tube to be put. I would need to know the length of the segments and whether a segment has been excised before commenting. I suggest that you take the child to his treating physician and get him evaluated. 