Infant sepsis is usually a serious infection in the body, manifested by the invasion of pathogenic bacteria into the bloodstream, where they grow and multiply and produce toxins, causing a state of systemic infection. The first symptom is systemic toxicity, such as a generalized fever, which is usually high and persistent, with a body temperature of more than 39.5 degrees or even 40 degrees. It may manifest as respiratory symptoms, such as coughing, coughing up sputum, shortness of breath, or in severe cases, bruising and difficulty in breathing. If it causes symptoms of the central nervous system, it usually manifests as poorer mental health, vomiting, and irritability. If there is no suppression of the central nervous system, early comparative excitement will result in irritability, and severe suppression will result in poor mental health, drowsiness, and even coma, convulsions, and shock.