Lactivism is when some grown-ups think that the very best way for babies to have food is from their mommy's body. When a mommy has a baby, her body makes special food called milk that is perfect for the baby to drink. The lactivists think that mommies should give their babies this milk all the time, even if it's hard for the mom and no matter what anyone else thinks. They want to make sure that all mommies have the choice to feed their babies this way and that nobody makes them feel bad about it. Imagine having a yummy snack that you love and always want to eat - that's what lactivists want for babies and mommies!