Hi, I have a 3 and 1/2 month male baby, who has been on exclusive breast feeding from birth. However for last 7 days, he has been refusing to suck breast and only taking expressed breast milk with lot of effort and persuasion. Although for last 2 days, he has started sucking only in sleep. My paed asked to do a blood test where lymphocyte count has come as 84% and peripheral blood smear study shows lymphotoic leukocytosis. His haemoglobin is 12.5 gm/ dl and ESR has been found to be normal. He is normally playful and agile but cries when we try to feed expressed breast milk. Kindly advice possible causes, action and if this is cause for concern