The reticulocyte count is the first to rise. This is followed by elevation of haemoglobin levels. body iron stores are restored after correction of haemoglobin levels. `Rise in Reticulocyte count occurs by the second or third day. This is followed by elevation of haemoglobin levels. Body iron stores are repleted after correction of haemoglobin levels. - GhaiThus Rise in Reticulocyte count → Rise in Haemoglobin Restoration of iron stores ferritin  Time SpanWithin 1 day (24 hours) Within 2 days (48 hours) Within 2-3 days Up to 2 months Still laterResponsible with the start of iron therapyThe child becomes less irritable Appetite improves Initial bone marrow response Reticulocyte count increases Restoration of haemoglobin levels Restoration of iron stores (Ferritin levels)