I agree with Mary Kay. Nipples don't callous! There are several
reasons beyond the possibilites she states that nipples get less tender
after the first few days:
- infants use less positive pressure (compression) and negative pressure
(suction) as milk supply increases, which reduces stress on nipples.
- the increased milk lubricates the nipple and reduces friction.
I don't know where you can find good research on nipple soreness. What
there is pretty much says "pain is common in hospitals" = "pain is normal".
Catherine Watson Genna, IBCLC NYC
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