Which hormone is secreted at the time of parturition?

$A$: Corticotrophin-releasing hormone is a part of the clock that establishes the timing of birth.
$R$: The signals for parturition originate from the fully developed foetus and placenta,which induce mild uterine contractions called the foetal ejection reflex.

Colostrum,the yellowish fluid secreted by the mother during the initial days of lactation,is very essential to impart immunity to the newborn infants because it contains:

Explain the process of lactation.

$A$: Oxytocin acts on the uterine muscles and causes stronger uterine contractions,which in turn stimulates further secretion of oxytocin.
$R$: Oxytocin is released from the maternal pituitary.

Oxytocin mainly helps in .....