Thank you so much everyone. I just feel so incredibly grateful that my sister wants me to do this and that I can do something tangible and practical to help her - and me - through this.
Jkklpu - yes, I have succesfully frozen my ebm before. But how awful for you not to be able to.
My only issue now is building up supply. I wonder if anyone can help on this? I normally feed 11 month old DS morning, at some point during the day (varies when, somtimes a quick go if we are out and about at playgroup with my older DD, sometimes if he wakes after short while from nap I will give him a bit of breast to resettle), and in evening. I also give him two bottles of formula, one during the day at some point, and one after his bf in the evening (only introcuded the formula once he started biting with his new teeth a few months ago! So eg at night, I feed for as long as he doesnt bite, then when he bites I take him off and finish the feed with a bottle). Then probably 2 or 3 times a week I feed once or twice in the night - when he wakes I always feed him to resettle basically. Other nights he sleeps through. He also has a really good appetite and eats lots of solids. So all in all, I dont really know how much breastmilk I produce for DS, not masses, but still fairly significant I think.
So, I expressed once last night after his 7pm feed, then three times today, once after his morning feed, once at lunchtime (when he was asleep, before I gave him a bit of a bf about an hour later) and ocne this evening after his 7pm feed. I am getting about 10 - 20 ml each time. Which doesnt feel very much. In the first 6 months of exclusively bf my DS, I could express around 100-150ml anytime I wanted (very lucky) so I have never had problems with milksupply, with either my DD or DS,when exclusively bf. Obviously I dont expect that to be the case now. But does anyone have anyone advice on a) whether I can build this up to produce more or b) when and how often I should be doing it, both in trying to get my supply up (how long would that take?) and once it is 'up'.
It all feels a bit unknown, I dont quite know how much I want to be producing, I just want to be able to produce as much as possible to give my dearest sister as much as I possibly can.