My boss and I agreed when I went on mat leave that I would come back may 1st. Well he called me today saying he's desperate for me to be back to work and needs my help (I'm pretty dang good at my job. Plus we have a small staff so one person missing is a big deal). He said he would let me choose my schedule until may 1st, as long as I'm back.

I am interested in going back part time before I jump into full time work...I think it'll be beneficial to me, plus although I will cry when I have to leave T, I'm ready to start normal life again.

Normally I work M-F 8am-4pm.
We are using an in home daycare M-W, a family member on Thursdays, and DH will watch him on Fridays because he's off work. I was planning on meeting with my babysitter in a couple of weeks to go over breastmilk handling and other things about his care but now I will need to rush. Same with DH's family.

I will be pumping at work. What schedule would you all suggest? I can probably use the rest of this week getting child care arrangements finished and start leaving him (sob sob) next week.
I would be unfair if I didn't work mondays. They are the toughest day of the week and they need my help. I was thinking Mon and Wed 8-4 and Friday 8-12. That gives me 20 hours.

Any advice? WWYD?

ETA: My maternity leave is unpaid and basically just an agreement between my boss and I. No paperwork or hours or anything will get messed up if I come back early.