Fast breathing of newborn babies may be a normal phenomenon, or it may be related to neonatal pneumonia, congenital heart disease and so on. 1. Normal phenomenon: because the central respiratory system of newborns is not yet well developed, may cause newborns to breathe fast, if there is no other abnormalities, consider it a normal phenomenon. 2. Neonatal pneumonia: The baby may inhale the amniotic fluid during delivery, which may cause neonatal pneumonia and fast breathing. 3. Congenital Heart Disease: Babies with congenital heart disease may also suffer from breathlessness, fast breathing, and dyspnea. Newborn babies breathing fast, there may also be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor’s treatment.