Speaking or Noise during Kiddush
Kavanah to Be Yotzei
31. During Kiddush, listeners should hear every word and have in mind to be yotzei their chiyuv of Kiddush. They should not be doing other things or gesturing with their hands. They should stand in one place (מ''ב סי' רע''א סקמ''ו).
Interrupting before Eating
32. If someone made Kiddush and spoke about something unrelated to the seudah or Kiddush before eating (מ''ב סקע''ה), he should say Hagafen again, but he doesn’t need to repeat Kiddush (שו''ע רע''א סט''ו).
33. Cup spilled. Similarly, if the cup spilled before he drank from it, he was yotzei his chiyuv of Kiddush but since new wine must be brought from elsewhere, he must say Borei Pri Hagafen again (שו''ע שם). If there was a bottle of wine in front of him, the Hagafen covered it bedieved and he does not need to repeat Borei Pri Hagafen.
34. If one of the listeners spoke in the middle of Kiddush, he is yotzei as long as he heard the main essence of the brachah, the beginning, and the end (מ''ב סי' קפ''ג סקכ''ו).
35. Lechatchilah a listener should not speak until the one making Kiddush drinks a cheekful. If one spoke after the mekadeish tasted even a drop, he is yotzei. If one spoke before the mekadeish tasted anything, he is yotzei Kiddush but must say Borei Pri Hagafen before tasting the Kiddush wine.
Two Voices Are Not Heard
36. It is common for many people to say Kiddush at once at big seudos, e.g., Shabbos sheva brachos or a bar mitzvah. Each person says it in a loud voice to be motzi his family standing nearby. Lechatchilah they should not all say it simultaneously, as “two voices are not heard” (מ''ב רע''א סוף סק''ג). However, if it was not at the exact same time and one has no other choice, he may be meikel since the Kiddush of each person’s husband/father is more dear to them, and in such a situation, we do not say that two voices are not heard (מ''ב סי' תפ''ח סק''ח).
37. A baby crying during Kiddush is not a problem of “two voices...” since the sound of crying has nothing to do with Kiddush and a person is interested in the Kiddush, not the crying (חוט שני ח''ד פפ"ה סוף סקי"א).
