Occasional high lymphocyte counts in six-month-old babies do not have much clinical significance, but persistent high lymphocyte counts may be caused by viral infections, lymphoblastic leukemia and other diseases. Occasional high lymphocyte counts in six-month-old babies without other symptoms are generally of little clinical significance and are not a cause for concern. However, if the lymphocyte percentage is persistently high, it may be caused by viral infection, and clinically accompanied by symptoms such as runny nose, sneezing, fever, etc. In addition, high lymphocyte percentage may be related to lymphoblastic leukemia, etc., which needs to be analyzed comprehensively with the baby’s clinical symptoms. If your baby has high lymphocyte percentage, it is recommended to consult a doctor in time for a clear diagnosis.