The hormone oxytocin aids the birth process by...?

Oxytocin is used in child birth to strengthen uterine contractions.

it is used during labour(first stage) when the uterine contractions are hypotonic(weak contractions).in his case its used to augment the contractions for efficient effacement and dilatation of the cervix.

After second stage ie immediately after the expulsion of the placenta, oxytocin is given intramuscular to contract the uterus back to non gravid state and to prevent further bleeding from the placental site.

It is also given after a complete spontaneous abortion to also contract the uterus and prevent further bleeding from placental site