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>> “why can it not require a breastfeeding mother to drape while she nurses?” <<
Because its stupid.
Do you hold a napkin in front of your gaping maw as you shovel grub down that disgusting hole?
.
What was your point?
BTW, anything I’d be using for a drape would be far more clean and sanitary than any surface in a public lav. I can heartily sympathise with any mom not wanting to take a baby in there to nurse.