Under normal circumstances, the number of breaths per minute in adults is between 16-20 times, and the breathing rate of newborns is between 30-50 times per minute, and the number of breaths will gradually decrease as they grow older, about the same as the number of breaths in adults after 12-16 weeks of age. If the respiratory rate is higher than normal, it should be ruled out that it is due to physiological increase. If the respiratory rate exceeds normal in a calm state, most of them are caused by fever, hyperthyroidism, elevated blood pressure, bad heart or respiratory diseases.