Update on Kaiser Walnut Creek Birth Ball Usage:  Kaiser WC no longer provides birth balls to laboring women. If you are planning on birthing there, you must bring your own birth ball.  Birth balls and pumps cane be purchased at Marshalls and Ross for about 9.99-12.99.  Birth Balls a.k.a Yoga Balls come in various sizes so make sure you check how many centimeters it is before purchasing it.  The average laboring mom needs a 65cm ball.