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

Under the influence of oxytocin,which layer of the uterus exhibits strong contractions during parturition?

$A$: 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 signals for parturition originate from the fully developed foetus and the placenta, which induce mild uterine contractions known as:

Statement $P$: Mother's milk is very essential for a newborn infant.
Statement $Q$: The secretion of colostrum contains abundant antibodies.

Sometimes the labor pains are less and uterine contractions have to be induced. What do you think the doctors inject to facilitate delivery?