Symptoms of fever in three-month-old babies appear as lack of spirit, wilting, loss of appetite, red lips, pale or flushed face, fear of cold, red eyes, shallow and fast breathing, also feel some fever in the mouth exhaled gas, accelerated heart rate or pulse, dry skin, emotional instability, crying, drowsiness, reduced frequency of urination, yellow urine, some may also appear nausea, vomiting and other digestive system symptoms. If the above symptoms appear, parents are advised to measure the baby’s temperature in time. According to the measurement results, if the temperature is below 38.5℃, physical cooling can be carried out, such as warm water baths or forehead antipyretic patches, etc. A small amount of warm water should also be given to the baby to replenish water. If the temperature exceeds 38.5°C, consult your pediatrician for medication such as acetaminophen to lower the temperature.