Wis. Stat. § 253.165: Right to breast-feed.

A mother may breast-feed her child in any public or private location where the mother and child are otherwise authorized to be. In such a location, no person may prohibit a mother from breast-feeding her child, direct a mother to move to a different location to breast-feed her child, direct a mother to cover her child or breast while breast-feeding, or otherwise restrict a mother from breast-feeding her child as provided in this section.