(Disclaimer: This article is for scientific purposes only. In order to protect the patient’s privacy, the relevant information in the following content has been processed) Abstract: A 3-month-old female baby was brought to our hospital by her parents. It was stated that the baby had a temperature of 38.2°C and fever for 2 days, but feeding was normal, stool and urine were basically normal, and there were no other signs of discomfort. After detailed examination and analysis, the baby was considered to have muffled fever syndrome, a common infantile syndrome, caused by too hot a blanket. After providing health education to the parents, the parents unwrapped the baby and carried out appropriate home care, and the child’s symptoms gradually disappeared. Basic information] Female, 3 months [Type of disease] Infantile muffled fever syndrome [Hospital] Shanghai Sixth People’s Hospital [Date of consultation] August 2020 [Treatment plan] Unwrap the baby, adjust the room temperature, feed more warm water, and replace the blanket [Treatment cycle] Return to the clinic after 2 days of home care [Effect of treatment] The child’s symptoms have improved, her body temperature has returned to normal, and her mental response is fine. In August 2020, his parents brought him to the fever clinic of our hospital with a temperature of 38.2°C. The parents indicated that his general condition was good. The parents indicated that the baby was in good general condition, with normal feeding, urination and defecation, response and mental status, and no other signs or symptoms of discomfort. The baby was given a routine blood test, although some indicators are elevated, but combined with the actual situation of the child, infectious diseases can be ruled out, and the nucleic acid test results were negative. On the day of the consultation, the outdoor temperature was about 37℃, and the baby was covered with 4 layers of thick blankets. After careful physical examination, the baby was found to be hot all over the body, and there were no other abnormalities, so the baby was considered to have muffled fever caused by infantile muffled fever syndrome. Treatment The ability of the newborn baby to maintain its own body temperature is weak, and it is easily affected by the external environment. Therefore, in order to avoid catching a cold, many parents used to put more clothes on their babies, which makes it easy for the baby to develop muffled fever syndrome. After communicating with the parents about the baby’s condition, the parents expressed their willingness to actively cooperate with the treatment, so they were instructed to go home and make sure to give their babies heat dissipation, monitor the temperature changes, and replenish more water, and follow up with them in 2 days. The parents took the baby home after unwrapping the blanket and adjusted the baby’s care methods, such as lowering the air conditioner at home to about 26℃, feeding more warm boiled water as appropriate, and replacing the usual quilt with a thin blanket. Third, the therapeutic effect Go back to the treatment for about 1 day, the baby’s body temperature gradually dropped, basically back to normal levels, mental state also improved, eating milk appetite also improved. On the 3rd day, the parents brought the baby back to the site for follow-up, and once again, the temperature was completely normal, the skin was not hot to the touch, and the condition was very stable in all aspects, so the parents said they were finally relieved. Note: We are glad that the baby’s discomfort disappeared after treatment and his health was restored. In daily life, parents need to pay attention to the fact that babies’ thermoregulatory center is not fully developed, and the way of heat dissipation is different from that of adults, so very often the surface of the body will be too hot or too cold, but there is no need to worry too much. Normally, you can touch the baby’s hands and feet to determine whether the baby feels cold or hot, if the end of the hands and feet are in a warm state, the probability will not catch cold. Ideally, the ends of the hands and feet are warm, and the temperature of the head and face is cooler than that of the hands and feet. Parents can use this as a target for increasing or decreasing the amount of clothing to prevent their babies from catching cold or suffering from Infantile Muffled Heat Syndrome (IMHS) again. The baby in the case was relatively young, and the parents ignored the baby’s feelings because they were worried about catching a cold and used a thicker blanket, which in turn caused Muffled Heat Syndrome in infants. It is recommended to increase or decrease clothing according to the baby’s actual feelings, and not to blindly increase the blanket to avoid muffling. If your baby has a fever, the first time is not to cover the heat and sweat, but should strengthen the heat. If the temperature is not relieved, go to the hospital in time.