Hellobee Boards

I kinda did? But I often would cool fresh milk and mix it with defrosted or heat defrosted and mix with fresh.

I never heard of this but I think I followed it anyway just because of how I organized my pumping and bottles.

Never followed it. I would sometimes pump directly into the same bottles with milk from earlier in the day at work.

I didn't worry about it. I would often pump directly into bottles already containing refrigerated milk from previous sessions that day. I would put them right back into the fridge afterwards though. I wouldn't have left them out and then re-mixed. As it is, I had to scald the milk once I got home anyway, so I figured bacteria would be killed at that point if there was any.

I pretty much always followed it. I think you don't want to warm the cooled milk for it to grow bacteria. If I was just adding 1oz to a pre bottle of like 8oz I figured it would be fine.

Lactation consultant said there was no actual research to back up the rule, so I've never followed it. Not sure how true that is as I've never looked for the research, but I've never had a problem combining.

I EP'ed, and I would generally let freshly pumped milk cool in the fridge before combining. If I was going to use the milk the same day, I might not worry about mixing warm/cold as much, but definitely wouldn't combine if I planned on freezing or storing in the fridge for a few days.

Agree with the raising the temp of the milk encouraging bacteria growth.