Imported FBX animations are tiny

The mesh is in right size, but the animations are pain to preview.

Any ideas how to fix this?

If you are using Blender, your scale is probably set wrong.
meters, .01
then you have to scale the animations you have up by 100 and re-export.
Moving forward you just have to make sure the scale is correct before working.

Yes. We are using Blender. Will try something with ur advice soon.

What MostHost says is absolutely correct, I can confirm, because I had the same issue a few months back.