When a new baby is born, the baby takes his breath for the first time through circulatory changes and by crying helps open the circulation to send oxygen through the lungs.
Crying in the baby helps open his lungs so he can breathe oxygen. And a gentle pat on the back of the baby's body is used to encourage the baby to breathe air. In addition, crying is also one way babies communicate.
Mothers who give birth to their children naturally or normally will show a greater surge in their brain activity when they hear the baby cry compared to the mother who gave birth caesarean.
In the Journal of Child Psychology and Psychiatry, the researchers described researchers using functional MRI scans to see the reactions of 12 women after hearing the baby first cry for 30 seconds. The scan shows that the baby's cry is able to regulate activity in various regions of the mother's brain, one of which is the amygdala, the part that plays a role in regulating maternal emotions.
In addition to helping the baby in breathing using his lungs, crying at birth also helps the activities of the baby's own limbs. Because when crying automatically the baby will move.
So it's only natural that the newborn baby cries, because that is the first time the baby can see the world. Precisely if the baby does not cry, it means something is wrong with the baby's condition and the doctor must immediately find out.