Removing animation "sudden moves"

Hi!

Always when I animate inside Unity, I get this sudden move on the object I am animating. Just when it loops. Example:
I create a idle animation. I just make the head tip down and up but when it loops, it goes a bit fast back into place. Kinda like a bouncing effect. I don’t want this. How do I remove it?

Thanks

I’m not sure I fully understand your example, but from what I gather, the head goes down slowly, but then it spontaneously pops back into place…If that’s the case, can you add the same sprites in reverse to your animation? That way the same sprites will be used in reverse to make his head appear to be going back up…