Hormone responsible for causing stronger uterine contractions is . . . . . . .

The signals for parturition originate from the fully developed fetus and the placenta,which induce mild uterine contractions called the fetal ejection reflex. This triggers the release of which hormone?

What is the yellowish fluid produced during the initial days of lactation after parturition called?

$A$: Colostrum is a very efficient means of transferring immunity to a newborn.
$R$: $IgM$ from mother's milk protects the baby from the respiratory infection usually affecting in young age.

The hormone that acts during parturition (child birth) but which has more effect on lactation is

Which hormone stimulates the secretion of milk during the sucking of milk by a baby?