I found an article that has some discussion on this subject. They looked at
breastfed babies who had been readmitted within 48 hours of discharge, and
six of 8 were circumcised, 5 of the 8 were LGA. They speculate that the
circumcision could have contributed to their feeding difficulties.
 Breastfeeding, Dehydration, and Shorter Maternity Stays, in Neonatal Network
Vol 15, No.7, October 1996, p 37-43
Fritzi Drosten