We report on two children who may represent a novel syndrome consisting of a deficiency of immunoglobulin‐bearing B lymphocytes and serum antibody, deficient intrauterine and/or postnatal growth, in‐tracranial calcifications, and acquired pancytopenia. Poor growth, intracranial calcifications, developmental delay, and hematological abnormalities are common manifestations of congenital infection. However, humoral immunodeficiency is not characteristic in these infections, and no infection was found on extensive evaluation. Rare genetic syndromes may mimic intrauterine infections and may also include immunodeficiency. However the children reported here lack important characteristics or share distinctive manifestations not described in these disorders. Infants presenting with apparent congenital infections in whom a specific infectious cause cannot be identified should be followed carefully with immunological evaluations since this disorder may be progressive and considerable morbidity is attributable to hematological and immunological manifestations. Am. J. Med. Genet. 95:17–20, 2000. © 2000 Wiley‐Liss, Inc.