Three-month-old babies’ nose can be seen in physiological phenomena, pathological conditions (such as acute upper respiratory tract infection), intervention needs to be decided according to the cause, such as environmental factors caused by the need to adjust the indoor temperature. 1. Physiological phenomenon: For 3-month-old babies, the nasal cavity is narrow, the nasal mucosa is rich in blood vessels and there are no nasal hairs, which makes them susceptible to external factors such as environmental factors or pathogenetic influences, resulting in the phenomenon of “nose huffing and puffing”. If the indoor temperature is low, you need to adjust the indoor temperature or increase the clothing. 2. Pathological conditions: such as acute upper respiratory tract infections, mostly caused by viral infections, can appear nasal congestion, manifested as “nose huffing and puffing”, may be accompanied by fever and other symptoms, usually within 1 week can be relieved, during the period of time can be used to alleviate the symptoms of nasal congestion of physiological sea saline, for fever babies need to be reasonably antipyretic. At the same time need to pay attention to whether secondary bacterial infection, if necessary, need to use antibacterial drugs (such as cefaclor) anti-infection treatment. The above drugs should be used under the guidance of a physician, and it is recommended to consult a specialist for intervention.