The estimation of gestational age (GA) is important in planning appropriate treatment for the infant and to modify details of care. The development of many neonatal issues in the immediate postnatal period is dependent on gestational age. Hence its accurate assessment is essential for perinatal practice. The best estimate of GA is based on sonography if it is performed before 22 weeks of gestation. When a consistent date of last menstrual period (LMP) or an early sonographic report is not available, postnatal assessment methods of newborn maturity is required. Widely used Expanded new Ballard Score with physical and neurologic criteria is complex and needs trained personnel to execute. Scores using physical criteria alone are easy to perform, less time consuming and has good interobserver reliability. These can be performed reliably even by non-pediatricians compared to score containing both physical and neurological criteria.

Keywords: Gestational Age; Ultrasonography; New Ballard Score; Eregie Score; Parkin Score.