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Background and Objective: Primary TORCH (Toxoplasmosis, rubella, cytomegalovirus, herpes simplex virus) and Treponema palidum infections in the mothers can lead to severe fetal anomalies. This study was done to explore the prevalance of TORCH antibodies in newborns with congenital malformations and their mothers in Gorgan-Iran. Materials and Methods: This descriptive, cross-sectional study was done on newborns with major congential malformations, during 20 months (2003-04) in Dezyani hospital- a referal gynecology center in Gorgan, in north of Iran. The blood sample of 64 newborns with congenital malformations and their mothers collected. Serologic testes were done on newborns and mothers' sera to determine IgM and IgG levels against rubella, toxoplasma gondeie, Cytomegalo virus, Herpes simplex type II with ELISA test. For Terponema palidum PRP test was used. Results: Four of 64 infants (6 %) had positive IgM antibody titers for Toxoplasma, Rubella, and Cytomegalovirus. Nine of mothers with affected newborns (14%) had positive IgM antibody titers for Toxoplasma, Rubella, and Cytomegalovirus. Conclusion: This study showed that the prevalance of TORCH antibodies are observed in 6% of birth defects, in this region.