If a Chosson & Kallah during the first week they got married attended a Bris, should the assembled recite Sheva Brachos after Bentching?
Young Israel of North Belmore's Practices and Procedures for Sheva Bruchos says the meal should be prepared specifically for the bride-groom, and as such would not be recited at a Brit.
no sources in the doc though.
I'm not a rabbi...
My assumption is that the sheva brachot (well, six) should not be recited, because the s'udat mitzvah is not in honor of the chatan and kallah; rather, it is for the mitzvah of milah.
A more interesting question, IMHO, would be, if the parents of the baby boy finally got married after he was born, should they say sheva brachot at the brit. Not a very common occurrence.