Introduction: Accurate estimation of foetal weight is of paramount importance in the management of labour and delivery. During the last decade, estimated foetal weight has been incorporated into the standard routine antepartum evaluation of high-risk pregnancies and deliveries. Aims and Objectives: To Study fetal weight in term pregnancy by Hadlocks formula using Ultrasound and comparison with actual birth weight of baby. Methodology: This was a Study carried out at medical college and hospital from January 2009 to October 2010 in the department of obstetrics and gynecology. Two hundred women at term were studied. The fetal weight was estimated at the time of admission. Fetal birth weight was measured by Hadlock method. The Statistical analysis done by SPSS 17. Result: Mean age of mothers was found to be 22.67 years of them 18 years minimum age was seen. Of 52.4 kg as mean weight of study population maximum weight found was 77 kgs. 142 cms was the minimum height found and 154.61 cms mean height of mothers.59% babies were normally delivered and 24.5% babies were delivered by LSCS. Instrumental vaginal delivery was performed in 16.5% mothers.The Mean ±SD for Actual birth weight (Grams) was 2643.00 ± 331.14 (Range-2000 to 3615)And Hadlock USG (Grams) Mean ±SD 2608.45 ± 285.94 (Range- 2010 to 3478). Hadlock had mean error of -34.5 gms. There was Significant difference in Birth weight predicted by Hadlock’s (USG ) and Actual birth weight (P<0.03) Hadlock had error of 100gms in 30.5% babies and only in 10.5% it was more than 200gms. Hadlock determines 95 % accurately birth weight with just 10% error and with 15% error birth weight is accurately determined in 100% babies. Hadlocks (USG) overestimated the birth weight in 41.5% babies, of them 12 and 14% had more weight upto 100 gms. 58.5% babies had their weight underestimated which was 51 to 100 gms and 101 to 150 gms less in 16.5% and 15% babies respectively. Conclusion: In our study, Hadlock’s formula showed the greatest accuracy in prediction of birth weight but it having some errors so it should be considered combining with the clinical assessment.

Keywords: Hadlock’s USG; Birth Weight; Foetal Weight