Results of gene polymorphisms investigation in 30 children with severe periventricular ischemia are presented. 80% of them had relatives with variety thrombosis under the age of 50 and all of them had 3-8 SNP-mutations. The most dramatic allele F5: G1691A was not registrated. More than 30% of newborns had two polymorphic genes of folic acid and 16,7% showed combination of folic acid with thrombophilia polymorphisms including MTHFR: C677T. We propose the prescribing of thrombophilic and folic acid SNP-mutations investigations for infants in perinatal period with severe and critical neurological brain damages.