The baby whislt in her mother's womb gets oxygen from maternal blood.
So the moment the baby gets exposed to the environment outside the womb she needs to breathe, she needs oxygen. And in the womb the lungs are deflated.
Oxygen enters the baby's respiratory system causing inflation of lungs which causes baby to cry
There is a famous saying about this ' only time the mother smiles while you are crying is when you were born.'
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