I remember hearing this quote from a HCI prof in the late 90's. I repeated this to a person who was in nursing, and they replied that helping babies figure out nipples (i.e. "latching") is actually a common problem for new mothers[1].

It's worth considering that survivor bias plays a role in the perceived intuitiveness of nipples.

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[1]https://breastfeeding.support/when-baby-wont-breastfeed/