Important to see their view of the new baby.
I never felt irritated by my older kids. If anything I was brought to tears. Imagine having your mama to yourself then suddenly sharing her and her not being available every second. I included my older on everything. Diaper changing, bottles, blankets, bouncer belt buckler, reading time while nursing.
I wanted my older to know that our baby joined our lives, we didn't join hers.
I think it's important to try and include them as much as possible and then make sure there is some time for just the two of you.