Get him.. his own Christmas Stocking... and put his name on it...
And what I do every year since my kids were born... is I get a photo ornament... from Kodak.
Here is the link:
www.kodakgallery.com
The photo ornaments are REAL cute and nice. Just last week, I ordered 2 for my kids. Every year I do that. One each for each kid.
Then, when they are all grown up, it will be a keepsake for them... to have on their own Christmas tree... when they have their own families...
and each year, each photo ornament shows how they have grown...
and in the meanwhile.. our own Christmas tree... is gradually getting decorated and filled with our kids' photo ornaments... and it is real cute. The kids, enjoy getting their annual ornament. And I always with a Sharpie, put the date/year on it. That is my "tradition" for them every year...
OR, (and I did this too), is make a cute little photo book for him... (I also used Kodak for this), for his birth and his first few months of life... then when he is a grown-up... it will be a fabulous memento for him... and his own family. In my photo books of my kids as a newborn, I even put in photos of my Hubby giving them their first sponge bath, for example. Or how they look when sleeping... or crying... or happy. Just cute little candid photos... of them. My kids, love looking at "their" photo books... and how they were as "babies."
all the best,
Susan