Researchers believe that what triggers the start of the birth process is when the fetal brain reaches a certain point of maturity and sends a signal that prompts hormonal changes in the mother, causing her uterine muscles to contract.

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Researchers have proposed that the fetal brain's maturity may signal the start of labor by triggering hormonal changes in the mother, leading to uterine contractions.

Researchers Believe That What Triggers the Start of the Birth