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If a woman's husband dies and she gives birth to a child who dies within thirty days, does she need chalitzah to remarry? The dispute between Rabbi Shimon ben Gamliel and the Chachamim over when children are considered viable creates complex yibum obligations. The shiur analyzes Shabbos (שבת) 136a-b to show how this uncertainty generates different rules for marrying a Yisrael versus a Kohen.
This shiur examines Gemara (גמרא) Shabbos (שבת) 136a-b, focusing on the fundamental dispute regarding child viability and its impact on yibum obligations. The core machloket between Rabbi Shimon ben Gamliel and the Chachamim concerns whether a newborn must survive thirty days to be considered a 'bar kayama' (viable child). According to the Chachamim, once a child is born alive, we assume it is viable even if it dies within thirty days from natural causes ('pihe hu meis'). However, Rabbi Shimon ben Gamliel requires the child to actually survive thirty days to establish viability, arguing that early natural death indicates the child lacked sufficient life force from birth. The Gemara presents several practical applications of this dispute. In cases of 'nofel min hagag' (falling from a roof) or being devoured by wild animals, both opinions agree the child is considered viable since the death resulted from external causes. The argument only applies when a child dies naturally within thirty days without obvious external cause.
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Shabbos 136a-b
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Why does the Gemara say one Shabbos protects from Amalek while two Shabboses bring redemption? The shiur applies a principle from Kiddushin about repetition changing psychology: the first time doing anything is experimental, but the second demonstrates genuine desire. True Shabbos connection with Hashem requires moving beyond spiritual curiosity to authentic internalization.
