Our GP asked me to run a CBC on my son 4 months ago when he had caught some infection.the CBC showed normal hemoglobin. My son was 6 months old then.some days ago he caught an infection that led to chest congestion and narrowing of air passages. A CBC was run again and it revealed below normal hemoglobin level. is such sudden reduction in hemoglobin level possible?what may have caused it?
How much fall in he is there? If fall for few grams then its acceptable.  If high fall is there than consult doctor for than. It is quite possible to fall hemoglobin for few grams.  It may be due to infection or some other reason. SND what is the AGD of your son because in neonatal period its common physiological phenomenon.