A Breastfeeding or Lactation Room is a private room other than a bathroom, that is shielded from public view and interruption, and is used by mothers who breastfeed or express breast milk by breast pumping.
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Marbles Kids Museum in Raleigh NC
So it's located on the first floor of the museum next to Curiosity Square, next to the toddler play area. To the right after you walk in.