How Does the Respiratory System Develop Prenatally?
The development of the respiratory system begins early in fetal life. By around the 4th week of gestation, the respiratory tract starts forming from the foregut. The lungs continue to develop through various stages, including the pseudoglandular, canalicular, saccular, and alveolar stages. By the time a baby is born, the [alveoli]( ) are capable of gas exchange, although they continue to multiply and mature postnatally.
