My informal protocol is:
If baby transfers milk well with shield by test weights, I no longer
recommend that mom pump unless diaper (particularly stool) count is
below optimum.

If baby does not transfer milk well with shield, I try a smaller shield,
and if that does not work, I abandon the idea of using a shield, except
maybe for pacification and practice latching while mom pumps and feeds
via alternate feeding method.

--
Catherine Watson Genna, IBCLC  New York City  mailto:[log in to unmask]

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