M&S (or Morrison's equivalent or whetever) of heat-up Christmas lunch. Or just buy a few bits and ditch the rest. A friend in a similar situation had m&s turney and stuffing sandwiches for Christmas day, straight out of the plastic triangle!
Will it be you 4 for Christmas lunch? I'd be tempted to go non-traditional food-wise, or just a few easy staples.
Gifts buy now - Reastie has already started the Christmas Bargains Thread on this part of the forum. Make a list, get buying, tick off. You can buy stuff like wrapping paper online all year round, so when things arrive wrap them, label them, put them away - wrote down where you put them!
Send emails rather than cards, unless for someone like great aunty X who loves to receive a written card. You could cut your list down to say 5 people or so.
Our son is an early December baby and i totally nested before he came. Sewing, baking etc. We didn't have a 1yo to contend with though. We are abroad and had visitors all over Christmas and I ended up cooking 3 full Christmas lunches. I am an idiot!
If i were you, i'd hunker down and be low key. I'd offer around Turkish Delight and After Eights and mince pies if anyone visited, but there'd be bugger all cooked
Congratulations 