Variation in a few reproductive traits (i.e. clutch size, female body mass after capture and after parturition and hatchling body mass and lenght) of Lacerta vivipara has been studied in two populations from Serbia (Stara Mountain -Southeastern Serbia and Šara Mountain -Southernmost Serbia). Mean clutch size was reported as 6.9 and 5.9 for samples from Stara Mt. and Šara Mt., respectively. Absence of difference in mothers' SVL among samples indicates similar age structure, as SVL is strongly correlated with age. Mean hatchling body mass per female varied significantly within populations. Significant between-sample differences were detected for mean effective relative clutch masses. Absence of a trade-off between clutch size and the average mass of offspring in analyzed populations from Serbia could mean that there is a strategy of producing a clutch size characterized by good body condition, but this strategy can be varied in order to be able to subsequently reduce the size of the brood in poor years.