As uterine contractions push the fetus against the cervix during parturition, oxytocin release from the posterior pituitary is reflexively increased, which further increases uterine contractions.

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This is known as the positive feedback loop of labor and delivery. Oxytocin stimulates the uterus to contract, which in turn pushes the fetus further against the cervix. This, in turn, causes more oxytocin to be released, leading to stronger and more frequent contractions until the fetus is born.

As Uterine Contractions Push the Fetus Against the Cervix During