18 month old baby with lump in the stomach.... Doctors dont think is serious Im really concerned!!!?

Go with your instincs, you know your son they don't. If he is in pain and they aren't doing any tests then keep going to doctors. even though you don't have insurance call a pedatrition and get an emergency appt. They will help guide the hospital doctors by ordering tests. Doctors make mistakes and sometimes it takes a some pushing from us to get things done. Good luck I am praying for your little man!