The baby’s red throat and fever may be caused by acute pharyngitis, acute tonsillitis, herpes pharyngitis and other factors. 1. Acute pharyngitis: usually caused by viral and bacterial infections, due to the presence of infection, which can lead to redness in the throat area, accompanied by fever, sore throat, hoarseness, coughing and other symptoms. 2. Acute tonsillitis: mainly caused by viral or bacterial infections, invading the tonsils, can be an acute attack, which will cause the symptoms of red throat and fever, may also be accompanied by sore throat, dyspnea, generalized pain, fatigue and other symptoms. 3. Herpes pharyngitis: usually caused by enterovirus infection, resulting in inflammation of the oral cavity and the pharynx, which can cause symptoms of redness and fever in the throat, which may also be accompanied by sore throat, vomiting, diarrhea, poor appetite and other symptoms. If your baby’s throat is red and feverish, it is recommended that you take your child to the doctor for examination and treatment to avoid aggravation of the disease.