My son is about 1.5yrs old now but in that time I would say training has had to take a back seat a few times. In the beginning, I think I took a week or 2 off to help momma and make sure we were good to go. She stayed home with him for 3 months or so so I would go after work but I decided I was getting home too late- he was in bed within a half hour of me being home. I couldn't pull going after he fell asleep b/c my lady and I wouldn't get any time together.
I changed my lifting to be in the morning and we rotate days. Luckily, I think I've had maybe a couple handful of nights were he DIDN'T sleep all the way through so for the most part I've had it easy in that regard. Currently, I go to the gym T, Th, Fri following 5/3/1. The other days she goes and I get to hang out with little man in the morning and then take him to the nanny. So far, this seems to be pretty optimal.
Nutrition wise- no real changes. In the beginning he just ate off the nip-nip so we could eat however we wanted. Then we started to make his food by boiling it and using a magic bullet. It's cheaper than most store-baby food so we ate the same there too. Then he started to want our food so it has forced us to clean it up even more (I already eat pretty well) so that he pretty much just gets a portion of our food.
Little dude loves his organic chicken nuggets, avocados, and tomatoes so those are automatic backups for fussy nights. In case you like to dine out, for the first year or so it's pretty easy to do it since he will sleep or nurse a bottle. For the last 1-2 months or so he has been throwing things and acting out so we are severely limiting our meals out.
You can't really plan any of this out. In the beginning I think it's all about being able to adjust yourself to how things are and then you will eventually re-establish a pattern. Good luck and congrats!