Background and Aim The neurodevelopmental pace of late preterms during the first 2 years has hardly been investigated. Our aim was to assess longitudional neurodevelopmental status of babies of gestational ages (GA) between 34–36^6/7weeks (Group I), 37–40 weeks (Group II) with Bayley II Infant Development Scale (BAYLEY II) and neurologic examination done regularly and to correlate scores with the risk factors in neonatal intensive care units (NICU).

Method 100 infants (Group I) 50 (Group II) were included in the study all had serial BAYLEY-II scores and neurologic examination done at the ages of 6, 9, 12, 18, 24 months.

Results There were no difference between the total BAYLEY-II scores of the patients in both groups at all ages (p>0.05). However, the longitudional rate of change of the PDI and MDI scores of the two groups showed a different pattern. Between 6–9 months patients in group II had a higher rate of change of PDI scores than those of Group I (P<0.05) between 12–18 and 18–24 months; it was viceversa (P<0.05) There was no significant difference between groups regarding to the change of MDI scores at all ages. When the pooled data was evaluated; of the NICU risk factors only mechanical ventilation had an impact on BAYLEY-II scores (p<0.05).

Conclusion Knowing the rate of neurodevelopmental follow up of these patient group could be important when an early individualized management is needed.