Is there any other associated problem like related to kidneys or
liver. Any recent surgeries? If not then he needs iron rich diet like spinach, jaggery, bananas. Avoid milk products with meals, it decreases the absorption of iron. You can supplement iron along like syp. haem up once a day for 15 days.
Next Steps
check hb after a 15 days again
Health Tips
syp haem up will cause little indigestion, or black stools.