The main signs of anorexia are anorexia, shortness of breath, mouth pain, nasal congestion, loss of appetite and wheezing. 1. Anorexia: Infants will have refusal to drink milk and have little interest in drinking milk. 2. Shortness of breath: mainly seen in acute respiratory infections, or infants with congenital heart disease, resulting in infants experiencing labored breathing and increased respiratory rate. 3. Oral pain: usually occurs in acute pharyngolaryngitis caused by sore throat, or thrush, ulcers, herpes, gingivitis, etc. When eating, the inflamed parts of the child will be stimulated, causing pain and discomfort. 4. Nasal congestion: It is mainly due to the secretion blocking the nasal cavity, which is manifested as symptoms such as the nose is not ventilated or the ventilation is not smooth. 5. Loss of appetite: the child mainly shows that he/she does not want to eat, his/her sucking power is weakened, and the amount of milk he/she sucks is reduced. 6. Wheezing: if suffering from allergic asthma, bronchitis and other diseases will lead to the infant breathing is not smooth, throat rumbling and other symptoms. Parents are advised to bring their children to the hospital in time, under the diagnosis of the doctor, according to the condition of the child, to take targeted treatment.