In a retrospective study on 86 twins born between 1971 and 1990, the clinical and acidity status of small for gestational age twins in cases of uncomplicated labor was analysed and compared with the status of appropriate for gestational age twins. No difference was observed in Apgar score and umbilical blood pH between growth retarded and normal twins. The single fact of growth retardation without other factors of risk during labor has no influence on clinical status of small for gestational age twins.