from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
POSTHUMOUS CHILD. after the death of its father; or, when the Caesarian
operation is performed, after that of the mother.
2. Posthumous children are entitled to take by descent as if they had
been born at the time of their deceased ancestor. When a father has made a
will without providing for a posthumous child, such a will is in some
states, as in Pennsylvania, revoked pro tanto by implication. 4 Kent, Com.
506; Dig. 28, 5, 92; Ferriere, Com. h.t.; Domat, Lois Civiles, part 2 ' liv.
2, t. 1, s. 1: Merl. Rep. h.t.; 2 Bouv. Inst. n. 2158.