Within how long must bottle feed bm be consume once warm it? Can i warm it by putting the bottle in a cup of hot water?

Yes you can warm up with hot water but remember to move the Frozen bm to the chiller section first. I will keep it to one hour after warming up , anything longer I will usually throw away the milk. Our weather is so hot and humid, it is easy for bacteria to breed so I won't take a chance.

Yes it's fine to warm it up with a cup of hot water. Usually I will change the water twice as 1 time doesn't get the milk warm enough. As for feeding, I try not to exceed 1.5hours from the time of warming up as our weather is quite hot and bacteria can breed easily.

yah can warm up with warm water. consume in 1 hr