It Will depend a lot of the temperament of the kids, my Dd was an easy newborn, and DS took to being a big brother very easily. If I had of had the kids in reverse order it would have been a different story.
Anyway, here's some things I did:
Before NB arrived
-Play with dolls before newbie arrived and talk about what it will be like with a new baby
-Read lots of new baby books together
After NB arrived
- I didn't worry about bathing newbie very often a all, maybe once a week if she was lucky. Takes the pressure off.
-Swinging rockers are great, just teach the older one not to rock it for you, otherwise newbie will be in for a wild ride.
-When I bf'd newbie I read a book to DS all cuddles together on the couch. I was lucky DD was a great feeder and could self attach early on.
-Lots of cuddles all together, make big deal of being a family, everyone loves each other. I let DS cuddle DD a lot but always with lots of supervision, and told him the importance of being a big brother and how lucky he was and how special it is.
I once went for a walk around the block with DS for mummy and son time and left DH with DD alone. When we left DS yelled out "don't break her ok dad" !!