A newborn’s nose can’t see the boogers when it’s huffing and puffing, which can be seen in physiological phenomena, respiratory infections, etc., and needs to be analyzed on a case-by-case basis. 1. Physiological phenomenon: for newborns, immature development of the respiratory tract, the nasal cavity is narrow, the nasal mucosa is rich in blood vessels, more tender, and there is no nasal hair, easy to be affected by external factors, congestion and edema, such as the external environment of the temperature is low, there can be symptoms of nasal congestion, there is no secretion can not be seen “boogers”, is a normal physiological phenomenon, just pay attention to keep warm. This is a normal physiological phenomenon. 2. Respiratory tract infection: infected by pathogens (such as viruses or bacteria), invading the upper respiratory tract, symptoms of nasal congestion can occur, there may be no increase in nasal secretion, can be accompanied by moaning, spitting, some serious cases can appear hypoxia, such as cyanosis of lips and mouth, respiratory symptoms of increased speed, some children with both lungs auscultation can be detected in the fine wet rhonchi, chest radiography can assist in the diagnosis. There are other causes of similar symptoms, and it is recommended that the child be seen by a specialist if necessary to determine the cause.