I am an American and I had my baby in Kunming in October. He was healthy and everything went smoothly. I had all my prenatal care and ultrasounds and had my baby at Kunhua Hospital, which is near JinMaJiBi (close to The Hump). The doctors were great. If your wife does give birth in China, be prepared for no epidurals -- most hospitals do not offer them here. E-mail me if you want more info! jesslarsonwang at gmail.com
My aunt attended the AMI conference in Shanghai of this year and met someone operating a Montessori kindergarten in Kunming (which was news to me and I've lived here almost five years!). She'll be sending contact details my way, so I'll pass them on when she does.
Glad your son is enjoying Yunda K, it has a good reputation for a Chinese kindergarten.