Arguments at your workplace are very draining.  Maybe these will help.  When sharing with your supervisor perhaps use the phrase "hand expression can be as effective". 

http://newborns.stanford.edu/Breastfeeding/HandExpression.html

At the site below click on breastfeeding help and then scroll down to the link titled "When Baby Does Not Yet Latch"

http://www.drjacknewman.com/

Good Luck,

Jodie Lucci
LLL Leader, in NH USA
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