The reports suggest iron deficiency anemia (low Hb, low MCV, MCH, MCHC, low iron) along with low
calcium and phosphorus. This explains his weakness.
Next Steps
He should increase iron-rich foods like green leafy vegetables, jaggery, dates, pomegranate, pulses, lean meat, etc. and
calcium-rich foods like milk, curd, ragi, sesame, etc.
Supplements of iron, calcium,
vitamin D may be needed, but these should be started after consultation with a physician who can prescribe the correct dose based on age, weight, and other health conditions.
Health Tips
I recommend visiting a nearby physician for proper prescription and to rule out the cause of anemia.