Babies can generally take Merlin to lower their body temperature when it exceeds 38.5°C or higher. The most common cause of elevated body temperature in babies is an inflammatory response in the body, as seen in respiratory tract inflammation, when the body temperature fluctuates and even shows a gradual increase. Merlin, also known by its chemical name ibuprofen, is an antipyretic and analgesic drug mainly used to relieve fever, sore throat, headache, muscle pain and other symptoms caused by colds. Merlin stimulates the baby’s nerve center that regulates body temperature, causing the capillaries in the skin of the whole body to expand, resulting in sweating, and then lowering the body temperature through heat dissipation. At the same time, you should give your baby more warm boiled water, juice or glucose saline, etc., which can promote the cooling effect of the medicine.