Pumping for night session

lcp23

I just started pumping to start a freezer stash for when I return to work.  I only have about few ounces frozen so far and I pumped first thing in the morning.  I want to introduce a bottle.  I was hoping my DH could give him a bottle around 9 pm. 

Can I pump at night and my DH give that as his bottle, instead of taking from the freezer stash?

Should I pump morning and night?  Does it have to be consistent everyday?  For ex. can I pump every other mornnig?

When I return back to work in 4 weeks, can I cut out my night time pumping?

Thanks!