Disorder of the cognitive function and psychomotor retardation in the preschool and early preschool children is a result of neonatal bacterial meningitis in most cases. We have investigated 142 patients after neonatal bacterial meningitis and bacterial sepsis. We followed these children during 7 years (1998-2005). The whole contingency was divided into three groups: I group - bacterial meningitis (64 cases), II group - bacterial meningitis and sepsis (56 cases) and III (control) group - 22 patients with bacterial sepsis of different degrees. With the purpose of estimation of the psychomotor development, we have applied: Bayley screening test of infant developmental test (0 -2 y); Denver developmental screening test, and Denver-2 (0-6 y); Raven progressive matrices (5-11 y); Wechsler Intelligence scale for children (6-15 y). We have determined that the results of neonatal bacterial meningitis are predictors of severe long-term outcome of the disease. Analysis of the obtained data enables us to conclude that outcome of neonatal bacterial meningitis and sepsis in combination with bacterial meningitis is more severe than of bacterial sepsis.