INTRODUCTION This is a prospective study carried out at Ayinke house maternity hospital, the obstetrics and gynaecology department of Lagos State University Teaching Hospital between the 3rd of February 2007 to the 14th of October 2007. AIM OF THE STUDY This study aims to examine the predictability of actual birth weight using the product of symphysiofundal height and maternal abdominal girth during labour. METHODOLOGY A cross-section of the booked and unbooked patients at term with uncomplicated singleton pregnancies were interviewed before delivery. Exclusion criteria were multiple pregnancy, breech presentation, abnormal lie, antepartum haemorrhage, eclampsia, polyhydramnios, preterm labour, ruptured membranes, obvious congenital abnormalities and oligohydramnios. Symphysiofundal height, maternal abdominal girth, parity, maternal weight and age were obtained from 895 patients in labour, who fulfilled the inclusion criteria. The products of symphysiofundal height and maternal abdominal girth were obtained with the actual and predelivery birth weight. These data were stored and analysed on a computer using the Statistical Package for Social Sciences (SPSS) version 11. Frequency tables and graphs were made. Appropriate statistical procedures such as descriptive statistics (including means, standard deviations and standard error of means) were employed. Pearson’s products- moment correlation coefficient was used to compare similarity and relationship between the pre-delivery predicted weight and the actual birth weight. Multiple regression analysis was performed for predictive power of the independent variables (predictors).