Conversation: The conversation between human and AI assistant.
[|Human|] My son has been throwing up clear fluid with a little black in it. It started off with milk then it turned clear. Sometimes it has a lot of flem in it. Do you know what this could be? He is 2 month old boy. weighs 9.5 lbs and is around 21 inches long He has been healthy and eating and pooping great. Last night and today he has not peed and has not pooped for a couple of days.
[|AI|]  Hi, Welcome to Chat Doctor, Vomiting in your son seems to be very significant. Having gone through details would have given, it sounds to me like a surgical problem. One of the possibilities I can think of is hypertrophic pyloric stenosis which is a condition where one of the ends of stomach gets thickened and thus closes, so food doesn't pass down appropriately. If I were your pediatrician, I would refer you to a pediatric surgeon and get an ultrasound abdomen. I wish your son a good health. Take care.