A 9 month old baby isn't ready to wean themselves. Consider it to be a "nursing strike." It can turn into weaning if you don't help baby get back to the breast, though. Here's a link from Kellymom:
Help -- My Baby Won't Nurse!
http://www.kellymom.com/bf/concerns/...to-breast.html
Help -- My Baby Won't Nurse!
http://www.kellymom.com/bf/concerns/...to-breast.html