If you can afford it, buy unbreakable ornaments. What's life without a little chaos at Christmas time. The worst that can happen is the tree falls over. I'm assuming an artificial tree to avoid the spilled water mess.
Seriously, it's also a great time for you to teach baby that it's okay to look and touch and it's "no-no to shake the sap out of the tree."
Every child has a different, response to a Christmas tree, (including my children, grand children, nieces and nephews.)
One child was in awe, the other couldn't wait to pat it, one wanted to take it with him to the toy room, most wanted to pluck the ornaments (we put the un-breakables ornaments on the lower half of the tree and allow them to repeatedly remove and replace the ornaments.
We do have an ask "Mommy/Daddy/Grandma etc... before touching the tree and ornaments, so far it's worked for us. We'll see what this year brings.
You'll never know until you try.
A.