http://v.book.ifeng.com/book/ts/2875/197911.htm
#76 on this page: "至陰--小腳趾上藏有矯正胎位的妙藥"
Try to read this chapter to find out about the details or check out with a good acupuncture doctor.
Here is on Baidu.com "艾灸至陰矯正胎位,成功率較高":
http://baike.baidu.com/view/390344.htm
Good luck.