Newborns within 3 weeks of birth will only use their noses to ventilate. If nasal congestion occurs, especially when bilateral nasal congestion occurs, it can affect ventilation and feeding, which can cause asphyxia in severe cases, 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 it is due to foreign bodies, tumors, congenital developmental malformations and other lesions that simultaneously cause blockage of the nasal cavity, oral cavity and other airways, it can also cause asphyxia hypoxia or even brain damage.