Hi Pinkapple,reduce supply is one thing. the other thing u should watch out for is blocked ducts and engorgement.
Dont' wear wired bras for a start.
start lengthening the interval between expressing now. but the time u go back to work, baby will be starting solids soon so should be ok.
I read your blog and knew that you are still breastfeeding your boy, super! Wonder how you do it to maintain the supply when u return to work? You still pumping at work and how many times are u pumping there? Did you have a bad engorgement when u retun to work as you can not let your boy to latch on?
Sorry for asking so many questions but really wish to continue bfing my boy.