A 10 months old infant having weight 3.7 kg, his TLC at the time of birth was 87000. Now his TLC floats between 20000-29000.DLC in wnl. GBP is normal, cxr pa NAD, USG abdomen is NAD,T3 T4 TSH wnl.

Baby is admitted in Nutritional rahabilitaion centre his weight at the time of admission was 3.2 kg now after 20 days his weight is 3.7 kg. He has taken short of antibiotics. What could be the cause of high TLC?