If nasal congestion occurs, especially bilateral nasal congestion, it can affect ventilation and feeding, and in serious cases, it can cause asphyxia, and factors such as hypoxia can cause some degree of damage to brain tissue.
After 3 weeks, infants gradually learn to breathe by mouth, and when the symptoms of nasal congestion appear, most of them can be ventilated through the mouth, and the possibility of asphyxia and hypoxia is small. However, if a foreign body, tumor, congenital developmental malformation and other lesions cause simultaneous blockage of the nasal and oral airways, it can also cause asphyxia and hypoxia or even brain damage.