The laryngeal sounds made by newborns while breastfeeding are usually considered abnormal, and can be seen in congenital laryngeal stridor, respiratory tract infections, etc., and need to be analyzed on a case-by-case basis. 1. Congenital laryngeal stridor: laryngeal cartilage chondromalacia, can be manifested as low-pitched, intermittent inspiratory laryngeal stridor, laryngeal stridor can be aggravated by forceful inhalation, can be a few days to a few weeks after the birth of the onset of the disease, the onset of the 2 weeks after the birth of the more common, the symptoms of the milder can be manifested as a laryngeal stridor only when eating breastfeeding. 2. Respiratory infections: such as neonatal pneumonia, some children may show laryngeal stridor during breastfeeding, and also after crying, accompanied by spitting up or coughing and other symptoms, complete blood tests and chest X-ray can help diagnosis. The diagnosis can be made by blood tests and chest radiographs. Consultation and evaluation by a specialist is recommended.