The Collaborative International Dictionary of English v.0.48:

Fetal \Fe"tal\, a. [From Fetus.]
   Pertaining to, or connected with, a fetus; as, fetal
   circulation; fetal membranes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fetal
    adj 1: of or relating to a fetus; "fetal development" [syn:
           fetal, foetal]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "fetal":
   abecedarian, aboriginal, antenatal, autochthonous, beginning,
   budding, creative, elemental, elementary, embryonic, formative,
   foundational, fundamental, germinal, germinant, germinational,
   germinative, germiparous, gestatory, in embryo, in its infancy,
   in the bud, inaugural, inceptive, inchoate, inchoative, incipient,
   incunabular, infant, infantile, initial, initiative, initiatory,
   introductory, inventive, larval, nascent, natal, original,
   parturient, postnatal, pregnant, prenatal, primal, primary, prime,
   primeval, primitive, primogenial, procreative, rudimental,
   rudimentary, ur