8 ч 14 июл 2003 г. - Baby's lungs develop
Описание:
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.Добавлено на ленту времени:
Дата:
8 ч 14 июл 2003 г.
Сейчас
~ 20 г назад
