High blood counts in newborns, which generally refers to high white blood cells, may be physiologic or caused by intrauterine infection, postnatal infection, or severe vomiting. 1. Physiological factors: newborns may have physiological high blood counts if they only have elevated blood counts without other uncomfortable symptoms. Some babies’ blood counts may be as high as 20×10⁹/L, and they can usually return to normal on their own if they have normal body temperature, and they sleep, breathe, and have a good spirit. 2. Pathological factors: if there is intrauterine infection, or after birth by bacteria, viruses and other infections, there will also be elevated blood levels. If the newborn baby has vomiting, when the vomiting is more violent, it will also be due to the body’s stress reaction, there will be elevated blood, usually can be decreased with the improvement of vomiting. In addition, bleeding, hemolysis, leukemia, malignant tumors and other factors may also raise the blood level, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then under the guidance of the doctor to give targeted treatment or therapy.