Whether high neonatal leukocytes are dangerous or not depends on the clinical presentation. If the baby is in good spirits, eats milk normally, sleeps normally, has normal weight gain, and has no other uncomfortable symptoms, consider that a stress reaction has occurred after birth because of the huge difference between the mother’s womb and the outside environment. Because the baby has just been born, the immune system is not yet well developed, but is developing rapidly, so the white blood cell count will be high at this time. As the baby grows, this phenomenon will slowly disappear. If the baby has fever, cough, diarrhea, poor mental state, poor appetite, difficulty in breathing, weakness or other uncomfortable symptoms, and has high white blood cells, consider the presence of infection in the body, which is more dangerous. Parents are advised to take their babies to the hospital immediately to identify the cause and symptomatic treatment to avoid the development of the disease and endanger the baby’s life.