Tree ID hazelnut?

I found this seedling growing under my cedar. Here is the unknown branch ( left) side by side with a hazelnut (right). They look quite similar. There are some small differences though: the mysterious tree leaves have less serrated edges, smaller and pointy stipules, and less fuzzy backside.
If it's not a hazelnut tree, then what is it?

May Lotito wrote:If it's not a hazelnut tree, then what is it?

Definitely betulaceae.

Birch, hornbeam, and witch hazel don't shoot softwood growth like that, but hazel definitely does, especially young hazels.

If I was a squirrel, and who's saying I'm not, I would definitely stash my nuts under a cedar.  

hackberry/Celtis. almost definitely.

Thanks, I will keep this tree then.