Drinking from the cup at a bris

Hi,

After a brit milah (circumcision), a berachah is recited upon a cup of wine, followed by a second berachah, and then a prayer is recited on behalf of the baby, including the naming. Some are careful to drink from the cup before the additional prayer, but this is not necessary; that prayer is not an interruption in the eyes of Jewish law.

(Rivivot Ephraim 1:150:1)

Have a great day,
Mordechai