Babies cry when they are born mainly because their bodies are suddenly switching from life in the womb to independent life outside, and crying helps kick‑start breathing and respond to the intense new sensations.

What happens at birth

  • In the womb, a baby gets oxygen through the placenta, so the lungs are filled with fluid and not used for normal breathing.
  • When the baby is delivered and pressure on the chest eases, a powerful breathing reflex starts; the first big breath usually comes with a cry.

Why that first cry is important

  • Crying forces air deep into the lungs, helping them expand fully for the first time and pushing out remaining fluid.
  • This expansion and clearing of fluid raise blood oxygen levels and help the heart and circulation switch over to using the lungs instead of the placenta.

How the outside world feels to a newborn

  • Inside the womb it is warm, dark, cushioned, and quiet; outside it is bright, colder, noisier, and full of strong touch and gravity sensations.
  • That sudden sensory overload, plus handling, cold air, and sometimes mild birth discomfort, triggers a stress response that naturally comes out as crying.

Is it bad if a baby doesn’t cry?

  • Not every healthy newborn lets out a classic loud wail; some start breathing quietly but effectively on their own.
  • Medical staff focus on whether the baby is breathing well, has good color, and is moving; if there is no strong cry and breathing looks weak, they stimulate or support the baby to ensure good oxygenation.

Why crying remains important after birth

  • After those first moments, crying becomes the baby’s main way to communicate needs like hunger, discomfort, tiredness, or wanting contact.
  • Patterns in crying can even give clues about an infant’s health and nervous system development, so clinicians sometimes study cries for diagnostic insight.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.