In addition to whatever the original causes of the lip sucking were it
sounds like the baby is also used to a fast flowing milk supply.  Perhaps
Dr. Newman's breast compression technique would keep the baby's suck on
target.  I think that continuing to pump after feeds to build up the
supply might also help.

Sarah

Sarah Friend Barnett   LLLL, IBCLC
Bronx (New York City), NY  -  [log in to unmask]
" You are not obliged to finish the task,
 neither are you free to neglect it."       R. Tarfon