A person who strongly advocates, or campaigns in support of, breastfeeding (sometimes used with negative connotation, suggesting an uncompromising approach)
lactivists have taken to the streets to protect the right to breastfeed in public
Origin
1990s: blend of lactation and activist.
Definition of lactivist in US English:
lactivist
nounˈlaktəvəstˈlæktəvəst
A person who strongly advocates, or campaigns in support of, breastfeeding (sometimes used with negative connotation, suggesting an uncompromising approach)
lactivists have taken to the streets to protect the right to breastfeed in public