Pearl: How about asking the mothers to bring in pictures of their babies?
Then you could make a collage and keeping adding pictures to it.  Caption
under it could read "Hundreds of satisfied customers . . . 10,000 ounces
served"  (Maybe someday, thousands or even millions of satisfied customers
and who know how many ounces.)  Smiling faces on healthy breastfed babies
speak volumes!

We do something similar here in Mississippi at some of the WIC Distribution
Centers. We have a BIB (Breast Is Best) Club bulletin board where we put up
pictures of breastfed babies for all to see those healthy, smiling faces.  It
has had more success in some Distribution Centers than others--mainly a
function of the Lactation Specialist having the time to keep it up.  But,
where we do have it up, we get comments like, "Hey, I know ______'s mamma. I
didn't know she was breastfeeding.  He's always so healthy!"  Anyway, it's a
step.  We've found here that you just have to keep plugging and doing
whatever works best where it works.  If that makes any sense.