First stage of lung development is

Lung organogenesis is pa of the embryonal period. While fetal lung development consists in the pseudoglandular, canalicular and saccular stages, postnatal lung development comprises the stages of classical and continued alveolarization, as well as of microvascular maturation. The phases of lung development are mainly based on morphological criteria. Because most processes during lung development sta proximal and extend into the periphery, all phases of lung development overlap . Ref - pubmed.com