Fatal family history:[1]

7. Two siblings which died after Mila:[2]

Maternal siblings: A woman who has had two sons who have died after circumcision, is not to circumcise a third son, until he is much older and stronger. This applies even if the sons are not all from the same fathers.[3]

Paternal siblings: Likewise, a man who has had two sons who have died after circumcision, is not to circumcise a third son, until he is much older and stronger. This applies even if the sons are not all from the same mothers. However, some Poskim[4] rule that this worry only applies to maternal siblings and not to paternal siblings. Practically, one is to be stringent.[5]

Third child lived:[6] If the third child was already circumcised and lived, then it is possible that the danger no longer applies.

1. Two cousins which died after Mila:[7]

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] See Pesakim Uteshuvos 263:3-5

[2] Michaber Y.D. 263:2-3; Sefer Shemiras Haguf Vihanefesh [Lerner] 153:1-2

[3] Michaber Y.D. 263:2

[4] Agudah, brought in Rama Y.D. 263:3

[5] Rama ibid; Shvus Yaakov 1:79

[6] Maharit; Reb Akiva Eiger 263; Gilyon Maharsha 263; Sefer Shemiras Haguf Vihanefesh [Lerner] 153:5

[7] 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