I have been finding that my milk gets sour after pumping, so I did some research on the lipase thing, stopped taking my fish oil, started scalding after pumping and storing the milk in glass. I would pump, scald, pour into glass, put in the fridge to cool and then to the freezer once cool. I left my 10 mo DS with my parents one time and he did take his sippy so I figured it was fine.
Last night my husband and I went to a brewfest, so I spent the last month pumping so that he would have enough for the whole night. He wouldn't take the bottle from the babysitter, hubby or me, and when I smelled the milk it was SOUR! Yuck. Luckily I didn't have as much beer as I had originally planned so was able to nurse him and he slept happily (he has been bothered by beer before).
What can I do so that I can leave him with a sitter in the evening? We rarely go out but I would like to have the option. I only get 1-2 oz per pumping session (once a day) so it takes me several days to build up a milk stash.