S.H.
Hi,
I don't have 2 kids 'close' in age as yours, but I have 2 kids... thus, am used to the juggling act. LOL
Anyway, what works best, especially when you bring new baby home is... KEEP THE SAME ROUTINE FOR YOUR ELDEST SON, as is. Otherwise, it will be a 'transition' problem for him too. And a new baby is a 'new' thing in his life already... thus, keeping things as consistent for him as possible is best. Also, your eldest will need to know that he has his 'own' thing too... and he's not going to 'lose' anything or his 'specialness' just because of the baby.
Keep his naps as is... since it seems to work. Keep his nap times and pre-nap/pre-bedtime routines the same too. He already seems to be very good about his naps and bedtime.. so KEEP that. No sense in tampering with something that already works for your child.
The thing that for me works best, is keeping a routine daily, not doing things haphazard. When a child 'knows' the routines for themselves and of the family... then they are then 'cued' into the whole scheme of things... and thus, in time and later down the road... it will be 'easier' to get them organized. I'm not talking hard-core structure or 'scheduling.' Just a stable framework of things. Then that way, the child ALSO 'learns' the daily 'habits' of his Parents and the family. Thus, no 'culture shock' or abrupt changes for them to protest about etc. AND it provides the child with knowing what will come up and knowing what to expect and what to do. For me, this works. Children really benefit by having a 'routine' and knowing what is coming up. Even in schools they do this. And for you, it'll make the day more sane because you won't have to 'guess' at what to do next with all of them.
See what works for you... but by all means, really 'allow' your son to have his 'own' routine... and keep it the same as much as possible. Sometimes, once a new baby comes the eldest gets lost in the shuffle, because it is busier. You'll also need to make time JUST for your eldest son. One on one time.
It's great your Hubby has taken responsibility for his new role as well. That is great!
And with your new baby... as soon as he is developmentally old enough to be more regular about his naps/bedtime as well... then you can get him into a 'routine' too.
And, don't worry if some days are just bonkers! LOL It can't be helped. It's all a learning curve for all, once you have 2 kids or more! Once you get to know your new baby and what works or doesn't... then that will help as well.
All the best, and congratulations,
Susan