Analysis: The pediatrician was 40 days old and had a cough for 7 days. However, there is no aggravation, no fever, indicating that the infection is not heavy, there is no rhotic sound after the doctor’s auscultation, and although no chest X-ray was taken, it feels like there is no tracheal or pulmonary infection. Combined with the fact that the child’s family lives in the northeast and there is little sunlight, I consider the possibility that the child has congenital laryngeal wheezing. This disease is due to the child’s poorly developed laryngeal cartilage, and when the laryngeal cartilage covers the vocal chambers during inhalation, it makes a chick-like cry. This is called congenital laryngeal wheezing. Therefore, please give your child calcium and cod liver oil supplements and more sunshine to promote the development of laryngeal cartilage!