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Sign in to your FeedBurner account.Click the title of your FeedBurner feed on the My Feeds page.On the feed management page that appears, click the Edit Feed Details... link just below your feed's title.and over analyse button....


Code:
http://myblogname.blogspot.com/atom.xml
OR
http://myblogname.blogspot.com/feeds/posts/default
to the following format:
Code:
http://myblogname.blogspot.com/feeds/posts/default?max-results=3
(Note that max-results sets the number of posts you want to have appear in your FeedBurner feed. Any integer value between 1 and 500 is permitted.)
Click Save Feed Details. Your changes are immediately applied and FeedBurner re-burns the newly shortened (or lengthened) feed.

You can Resyncronise by clicking on Troubleshootize in your feed.

You can ping by Clicking here