Hi, Mummy. It could be bad latch, too, that's causing the duct. It helps to make sure that the entire areola is inside your mouth. And like Mummy Jorelle said, hot water bottle massage (or just a massage under hot water shower) helps to remove the duct. And when you're pumping, don't pump too hard. Check also that the flange is the right size for your breast. Wrong flange size could also affect the amount you pump and hurt your nipples.
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