Evergreen- Loving my girls Dylan age8, Ava age 4 and baby Georgia (6/3/11).
I personally found that my girls were hungry prior to 6 months. I can't imagine having waited until then. I have always nursed on demand, and have had no problem with supply, but I just don't think that all babies are ok with a strictly liquid diet for the full 6 months.
Anyway, I would nurse her before you go. Leave the EBM for her, and tell your parents that if she finishes the milk and is still hungry that they can try the other stuff. It's not going to kill her.
I think for tonight, it would be fine. Most likely, she won't even need it, but for your sanity, it would be great to have a backup.
Enjoy the concert!
Also, make sure to tell your parents to give her only an ounce or two at a time in the bottle, not all 7 ounces at once. If she finishes what's in the bottle, great, if not, then she won't have backwashed saliva into the bottle that will begin breaking down the milk and making it go bad too quickly.
Seven ounces is a respectable quantity, she may not get through it all depending on how long you're gone!
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WOHM married to SAHD, living the dream w/our: 3 girls (14,12,10) and 3 boys (7,5,3) and tie-breaker due Jan 2014
I still wouldn't give solids though. Is there any way you could leave the concert early or get there late?