Introduction: In today’s advanced medical world maternal child health care the important part of the healthcare system and important components is estimation fetal gestational age. Gestational age is age of unborn baby, defined in weeks as beginning from first day of last menstrual period prior to conception. Trimester is period of three calendar months during a pregnancy. Radiologically the period of gestation is grossly divided into three trimesters. Estimation of gestational age and thereby forecasting Expected Date of Delivery (EDD) is not only concern of the Individual but it is invaluable in the diagnosis of intrauterine growth retardation of fetus and obstetric planning. Hence we proposed the present study to evaluate fetal Head Circumference for measuring the gestational age. Materials and Methods: The study Correlation between gestational age and head circumference in second trimester was carried out at Govt. Medical College and Hospital, Nanded, between July 2011 to July 2013 period. The study included 150 pregnant women the data so collected was then subjected to statistical analysis by expert statistician with the help of SYSTAT Crainsoft version 12 software. Standard statistical methods, parametric methods were used for the evaluation and significance. Results: Variation in fetal growth on the basis of Head Circumference during second trimester can be explained to the extent of 96.65%. The value of R is highly significant (Student’s ‘t’ test value = 149.10, p < 0.0001, highly significant) showing that there is statistically positive correlation between gestational age and Head Circumference. Conclusion: From the present study it is found that Head Circumference and gestational age are statistically highly significant. The regression equations derived for growth parameter for estimating gestational age in a normally developing fetus, increase with gestational age, showed good correlation with gestational age. In Present study, Head circumference is the sensitive parameter and results of present study were comparable with previous studies.

Keywords: Age; Fetal; Gestational age.