pediatrician, neurologist
Hello! First of all, you need to understand the cause of low hemoglobin. Make a complete blood count (with reticulocytes and a color index is mandatory!) And a biochemical blood test: serum iron level, ferritin, transferrin, vitamin B12, folic acid, bilirubin (direct, indirect, general). The same urinalysis. With these analyzes, it is already possible to go to a pediatrician or hematologist.