Perot Museum of Nature and Science three areas around the building where nursing mommies can breastfeed or pump with more quiet and privacy.
The museum stated:
"Mothers who wish to breastfeed their child may do so in any public area of the Museum.
Additionally, there are three specific areas where nursing mothers who desire more privacy can go to nurse.
Level 4: partitioned area near the base of the staircase in the T. Boone Pickens Life Then and Now Hall leading to the Rose Hall of Birds
Level 1: benches in the restroom near The Hoglund Foundation Theater, a National Geographic Experience
Lower Level: restroom in The Moody Family Children's Museum"
Level seems to be the best of the three areas as it's not located inside of a restroom.