I always put the bottles in the fridge at DC and put the bottle with frozen milk in first and with the nipple on it so its ready to grab. We switched to sippys yesterday and today I put the frozen bottle in the front again. At pick up I noticed the bottle at the front of ds's tray was still there so I asked if they grabbed from the front and his teacher said, oh I just grabbed the one with the least milk so my bottle of frozen didn't get used!
I've always thrown in after the 24 hr rule, but this time it's 4oz!
Do you really need to use frozen milk w/I 24 hrs?