Unhelpful. And this is just one of the snide comments criticising the OP for daring to want to get things started a week or so earlier than you might want to! 
I don't decorate the first week, we usually do it mid-month - but LOADS of people do like to get decorations up at the start of the month and I never thought I'd be the person to defend this, but bloody hell, some of you are using this thread to exercise your Christmas snobbery!
Just leave the poor OP be. Lots and lots of people DO decorate in the first week of Dec. Lots of people DO like to make it special by wearing their jumpers, playing music, having a mulled wine while doing so, etc. And there are all sorts of reasons why you might want to, if you spent a few seconds thinking about it. Maybe Christmas is hard this year, because someone close to you died. Maybe you had terrible family Christmases as a child and want to make it different for your own kids. Perhaps you're depressed and trying to jump-start it a bit.
OP, it's true you can't make your DH feel festive if he doesn't want to. But I'd say that if he's totally uninterested in getting involved in order to make it nice for your children, particularly if he can't be arsed to fill their stockings while you're at WORK ffs, he might be a bit of an inconsiderate arse in other ways too. For instance, are there any plans in hand if you have your baby a bit earlier than due date? I had mine a week before Christmas and TBH I don't remember much of that first week - but DH was wonderful. He always cooks the dinner anyway but he did everything else (well, I think I did the stocking filling, being anal about that sort of thing!) and it must have been quite a strain, on top of the sleep deprivation we were both experiencing. Hope things go well with the birth. 
And I'm sorry about the night shift on Christmas Eve - you will be performing an invaluable service for really desperate people, and this time of year can really bring things to the surface, as you know.