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Stages and gestational ages of normal lung development and preterm infants at risk of BPD. Schematic depicting stages of lung development in the human: embryonic (1–7 weeks), pseudoglandular (∼5–16/17 weeks), canalicular (∼16/17–24/26 weeks), saccular (∼24–38 weeks), and alveolar (∼36 weeks to postnatal) stages. Preterm infants at risk of developing BPD are born during the late canalicular to early saccular phase of lung development.
