The Collaborative International Dictionary of English v.0.48:

Baptismal \Bap*tis"mal\, a. [Cf. F. baptismal.]
   Pertaining to baptism; as, baptismal vows.
   [1913 Webster]

   Baptismal name, the Christian name, which is given at
      baptism.
      [1913 Webster]

WordNet (r) 3.0 (2006):

baptismal
    adj 1: of or relating to baptism; "baptismal font"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "baptismal":
   High-Church, ceremonial, ceremonious, eucharistic, formal,
   formular, formulary, initiative, initiatory, introductive,
   introductory, liturgic, liturgistic, paschal, ritual, ritualistic,
   sacramental, sacramentarian