Instruct the parents to administer the iron supplement with vitamin C-rich juice and on an empty stomach to improve absorption, while monitoring for side effects.

Advise the parents to give the iron supplement with milk to reduce gastrointestinal upset and enhance tolerance.

Recommend switching to intravenous iron therapy immediately to avoid gastrointestinal side effects and ensure compliance.

Suggest stopping the iron supplement temporarily until the child's hemoglobin normalizes, then restart to avoid side effects.