Stockings for 2 month olds....I had, just in case DD arrived before Christmas Day itself, a few Christmas bibs, a rattle, a small jar of vaseline (travel bag size), and a Christmas onsie that a friend had bought in NYC. If there are older siblings, you'll HAVE to have a stocking, even if they can't enjoy it much themselves - but something nice and fun (small) and then lots of practical items that you'd be buying anyway just presented in the stocking 
Sorry, I've been MIA for a hectic week (and this week looks as bad, hence v early post from the desk before I get lost again).
And not a lot done practically about Christmas yet. Although I mentioned to DH that I'd been looking at cottages - and he sounded interested. So I may persuade him on that yet.
As for Traditions. DD has made an ornament for the tree every year (creche, school, and the odd venture into glitter and mess at home! ), which we have kept carefully. Some of these go on the tree every year but some are just kept for her own tree. (Cos I have LOADS of decs for the tree). I tend to buy an ornament every year though, when we are somewhere interesting - various hols worldwide or business trips, or just interesting things we spot coming up to hols here to mark special years (like the year we got married I got a crystal one).
DD and I , and last year DH, all get new PJs on Christmas Eve. And then after a bath (last year, I got a Lush "SANTA" bath bomb for DD's bath - wow that went down well!!), we read "Twas the night before Christmas" for the first time of the season. I have loads of Christmas books and stories and we read one most nights in December (I have to read a french one about the mouse family preparing daily - in french and then translate - at least 6 times in the month!!), but TTNBC gets saved for Christmas Eve.
And my own personal tradition, is that at some point after the tree goes up and before Christmas, when the house is quiet (like DD asleep and DH out at a work do), I turn on tree lights, off all other lights, (maybe light candles or the fire), and lie on the floor with a G&T reviewing the year past and making my plans for the year ahead (sorta New Year resolution type thoughts). Might manage 10 minutes, or an hour. But it's been an important time out for me ever since I was 16 and first raided my parents Jack Daniels stash while the rest of my siblings watched TV in the other room and I was the babysitter (not that bold cos I only had less than 1 measure and was already a beer/wine drinker sanctioned by parents). There have been quite a few years where it has been a soft drink. But the tree lights and the quiet are the important part.