The Collaborative International Dictionary of English v.0.48:

Prolicide \Prol"i*cide\, n. [L. proles offspring + caedere to
   kill.]
   The crime of destroying one's offspring, either in the womb
   or after birth. --Bouvier.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

PROLICIDE, med. jurisp. Medical jurists have employed this word to designate
the destruction of the human divided the subject into foeticide, (q.v.) or
the destruction of the foetus in utero; and infanticide, (q.v.) or the
destruction of the new-born infant. Ryan, Med. Jur. 137.