My husband and I just welcomed our baby boy into the world in May, and starting around August there will be a couple days a week we'll both have to go into work and wont be able to bring baby Ezra with us. By the time you are helping out with him he'll be 3+ months so newborn experienceis necessary. He's pretty chill and easy to deal with - only really cries when he's hungry or needs a diaper change. His nursery has plenty of activities, toys and books for wake windows.
Newborn care as needed on days when my husband and I both have work. Feeding, changing his diaper, that's pretty much it.