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8 h 14 jul 2003 año - Baby's lungs develop

Descripción:

your baby's lungs are beginning to produce surfactant, the substance that allows the air sacs in the lungs to inflate — and keeps them from collapsing and sticking together when they deflate.

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ByMarcos Abreo
7 dic 2017
0
0
292

fecha:

8 h 14 jul 2003 año
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~ 20 years ago
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