Why do newborn babies cry?

For your information .

Do you why do new born babies cry.i thought and read some articles. which research or which my mind accepted from scientific reason, i mention below

1-Inside the womb, the foetus relies on the mother for oxygen it receives oxygen from the mother's bloodstream via the umbilical cord. A foetus doesn't use its lungs for breathing inside the womb. Ever.

2-At birth the baby is forced to breath on its own for the first time. Hence, the baby cries or more precisely gasps for air. This 'cry' of the baby is actually a strong respiratory effort, thereby aiding the baby in its first breath. This is also why newborns don't produce tears on their first cry. Because it's not really a cry, it's a gasp for air.

Now the reason why such a considerable effort is required for the newborn to breathe is because

A) Lungs are being used for the first time, and

B) The lungs of a foetus are filled with amniotic fluid when it's inside the womb. Effort is needed to push this fluid out from the lungs after birth.


Thanks for reading

AdeelKazim