Jewish women for hundreds of years have their sons circumcised on the eighth
day of life.  The whole thing takes about 3 min.  The baby may cry for only
one minute and is  immediately given to the mother to breastfeed.  This is
the situation with all my observant friends with sons and I never heard of
them having any breastfeeding difficulty following circumcisions.  Maybe when
it's done as a medical procedure instead of the religious procedure by the
proper person it's different.