Mo. Rev. Stat. § 191.918: Breast-feeding in public permitted — not sexual conduct, public indecency, or obscenity — no municipal ordinances to prohibit or restrict.

1. Notwithstanding any other provision of law to the contrary, a mother may, with discretion, breast-feed her child or express breast milk in any public or private location where the mother is otherwise authorized to be.

2. The act of a mother breast-feeding a child or expressing breast milk in a public or private location where the mother and child are otherwise authorized to be shall not:

(1) Constitute sexual conduct or sexual contact as defined in section 566.010; or

(2) Be considered an act of public indecency, indecent exposure, sexual conduct, lewd touching, or obscenity or any other similar term for purposes of state or municipal law.

3. A municipality shall not enact an ordinance prohibiting or restricting a mother from breast-feeding a child or expressing breast milk in a public or private location where the mother and child are otherwise authorized to be.