Quoting USAF wf&m:" Im going to the movies tomorrow night for my bday and my 3 week old is going to be staying with DH. Hes ... [snip!] ... I plan to feed him before I leave but just in case he wakes up id like my DH to be prepared. Any help would be appreciated!"
I'd thaw like 2 oz. At that age, my daughter was only having 2oz max
when bottle feeding. At 3 months, she still only has 3oz or so each feeding. BM thaws out SO quickly if you put it in warm water, so if he needs more, he can thaw it out. But I know every baby is different.