Normally, HbF production starts to shut off at birth. In thals, small amounts are often still produced. This does add to the total Hb level, and in some thals, HbF production can beincreased by regularly using things like wheatgrass, folate and L-carnitine.
The ferritin is low. What is his Hb? What is the other boy's ferritin since the iron infusion?