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Why is the respiratory system is not functional until the sixth month or later?
Wiki User
∙ 7y ago
In the womb, the baby is encased in a sack called the Amnion. This sack is filled with fluid called Amniotic fluid, so the baby is encased in water and can not breath.
The baby's blood supply is connected to that of the mother by the umbilical cord and the placenta. The baby gets its oxygen from the mother by this supply and therefore does not need to breath while it is in the womb.
Thus the respiratory system only needs to develop fully later in the pregnancy (in preparation for the baby being born - when it must take its first breath) and it is therefore not functional earlier. Babies born too soon have great respiratory problems.
Wiki User
∙ 7y ago
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