$\bullet$ At the end of gestation, the completely developed foetus is expelled out. This process is called parturition.

$\bullet$ Parturition is controlled by a complex neuroendocrine mechanism.

$\bullet$ Estrogen and progesterone ratio increases as estrogen levels rise significantly.

$\bullet$ Prostaglandins, which stimulate uterine contractions are also produced that act on myometrium.

$\bullet$ Oxytocin, the main hormone, also called as birth hormone is released by maternal pituitary, which brings about strong uterine contractions.

$\bullet$ Prolactin is a lactation hormone that has no role in initiation of parturition.