Version May 2024
| Gestational age, weeks | Stage of lung development | Description |
| 0 to 5 | Embryonic | Lung bud arises |
| 6 to 17 | Pseudoglandular | Nonrespiratory bronchi and bronchioles develop |
| 17 to 24 | Canalicular | First gas exchanging acini and pulmonary capillaries are forming |
| 25 to 37 | Terminal sac | Subsaccules and alveoli develop with extensive capillary invasion and expansion of the alveolar-blood barrier surface area |
| 38 to age 3 years | Alveolar | Subsaccules become alveoli |
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