For the fetus, the stressful experience of birth is useful because it

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The stressful experience of birth is useful for the fetus because it ensures that it is fully awake and ready to breathe. During labor, the contractions of the uterus push the baby downward, which squeezes fluid out of its lungs. This helps to expand the lungs and prepare the baby for breathing air. As the baby passes through the birth canal, pressure on its head also stimulates the release of hormones that help to further open the airways and prepare the baby for breathing. Once the baby is born, it typically takes its first breath within seconds, and begins to adjust to life outside the womb.

For the Fetus, the Stressful Experience of Birth Is Useful