In reply to BAdhoc:
+1 for Petzl crampons. I have size 3 feet. Both sarkens and vasaks work well on my Nepals. I had to chop the end off the bar so it didn't stick out the back, but no issues with fit around the heel or toe.
If you want something more technical, I have heard good things about BD Cyborgs on small boots, but I haven't tried them personally.
Edited to add: for the Petzl crampons I have found the Leverlock heel and toe basket combination works best for me - that may obviously vary depending on your boots.
Post edited at 09:44