I have been pumping for 11.5 weeks and all of a sudden one breast is only half emptying. I need to hand express the second half after my pump session finishes. My other breast is emptying fine with the pump.
I've changed all the pump pieces and I've even tried a different pump but it's still happening. Can anyone suggest as to why this is happening and what I can try? I've measured my flanges and they seem to be correct, but I'm worried I might have elastic nipples, which I'm not entirely sure what that means.
Any advice appreciated.
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Do you have any pain or redness? Could be a blocked duct or mastitis, and your hand pump has a more powerful suction maybe?

I have the same situation. No pain or redness

I restart my let down phase at like the halfway point of pumping for maybe 3-5 minutes and that force the slacker boob to get its ish together!