"You are assisting at someone else's birth. Do good without show of fuss. Facilitate what is happening rather than what you think ought to be happening. If you must take the lead, lead so that the mother is helped, yet still free and in charge. When the baby is born, the mother will rightly say: 'We did it ourselves......!' "
Who do you think said this?
(If you saw this on my Facebook profile, you're lovingly disqualified. And no Googling!)