List of posts comments in sidebar

¡Hola a todos!
Hi!
I’m having some troubles with my sidebar. In the loop I show 3 posts, and I want the sidebar to show 3 more, with the comment number too. I’ve tried creating a new loop with the explanations I’ve found in the forums, but it doesn’t seem to work properly. It always show the same number of comments for each post listed in sidebar, even if there’s no comments in the post. Can anybody help me?
Raúl