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Distance and velocity of reference values for fetal growth are needed. Such fetal growth curves need to be continued postnatally. Ultra- sonography will provide curves of fetal head diameters and circumferences that fit such criteria. As a linear measurement of fetal growth, reference values for femur length are available from 14 weeks “post-menstruation” to term.This study showed there was a highly significant correlation between radiographically measured femoral length and recumbent length of the new­born infant. Thus, in examining the potential different outcomes in growth for the fetus-now-newly bom, femoral length prenatal serial measurements may be continued postnatally by measurement of another linear postnatal measure of growth—recumbent length.