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WordNet
posthumous birth
  1. n. birth of a child after the father has died

  2. birth of a child by Caesarean section after the death of the mother

Wikipedia
Posthumous birth

A posthumous birth is a birth of a child after the death of a parent. A person born in these circumstances is called a posthumous child or a posthumously born person. Most instances of posthumous birth involve the birth of a child after the death of its father, but the term is also applied to infants delivered after the death of the mother, usually by caesarean section.