Most children with high blood leukocytes indicate the presence of bacterial infections and can be tested for C-reactive protein at the same time. When the baby has symptoms such as congestion in the throat and fever, pay attention to the presence of purulent tonsillitis and give anti-infection treatment with penicillin drugs in time, paying attention to the course of treatment, about 10-12 days. If the baby has symptoms such as abdominal pain and vomiting, pay attention to diseases such as acute appendicitis or peritonitis. When your baby has a frequent cough, mainly at night, with persistent paroxysms, and there will be a decrease in neutrophils, pay attention to the possibility of whooping cough. When there is a significant increase in white blood cell count with enlarged lymph nodes, be aware of the possibility of blood disorders. In conclusion, many diseases can cause an increase in white blood cells, and it is important to see a doctor for an examination in a timely manner.