When To Drink
Question: At what point should the person making the Borei P’ri HaGafen drink the wine at a bris milah?
Short Answer: While there are multiple opinions on this issue, the prevailing custom appears to be to delay the drinking until after the K’rias Sheim (albeit giving the baby a taste beforehand). Nevertheless, Rav Moshe Feinstein zt”l and other poskim held that a small sip should be drunk before the K’rias Sheim.
