Infant born preterm have an increased risk of adverse long-term developmental outcomes.The risk associated with preterm birth increase as gestational age decreases, and vulnerability remains in moderate and early preterm (<34 weeks) and late preterm (>34 weeks). There are many studies in the literature showed that the prevalence of developmental delay increases with premature birth. However, there is no study in the literature investigates effect of early intervention program motor performance in subgroups of preterm infants. Hence the aim of this study is to evaluate the differences in effects of early intervention program on motor development in early and moderate (<34 weeks) and late preterm infants.