When the time does come, you can also try, "open, open, open!" and one that my midwife (CNM) suggested to me to say to the baby, "Hands over heart, chin to chest," as her ideal positioning for birth!!!
Best of beautiful, blissful births to you!
"To see a world in a grain of sand,<br />And a heaven in a wild flower,<br />Hold infinity in the palm of your hand,<br />And eternity in an hour." - William Blake