Two cousins which died after Mila:[1]

Two sisters which each have a son who have died after circumcision, the other sisters are not to circumcise their son, until he is much older and stronger.

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[1] Michaber Y.D. 263: 3; See Shvus Yaakov 1:79; Birkeiy Yosef 263; Gilyon Mahrsha; Pischeiy Teshuvah 263:7; Sefer Shemiras Haguf Vihanefesh [Lerner] 153:3