Data on the pre-weaning growth traits of 815 Egyptian native baladi calves borned from the period 1993 to 2014 were used to study the non-genetic, and genetic phenotypic factors of pre-weaning growth traits. The data were collected from Animal Production Research Station at El-Serw, Ministry of Agriculture. Covariance component for birth weight (W0), weaning weight (WW) and average daily gain from birth to weaning (ADG) were estimated by using least squares and maximum likelihood (LSMLMW) computer program of Harvey (1990). Model included sirs and dams within sires as random effects, year and season of birth, sex of calf and parity of cow as fixed effects. In addition, cow weight at calving and suckling days were used as covariate. The means and standard deviations of body weight at birth, weaning, and average daily gain were 23.47±4.29 kg, 80.59±6.36 kg and 0.477±0.06 g/d, respectively. Statistically season and year of calving and parity of cow did not showed significant effects, but sire and sex of calf had significant effects on studied traits. The values of heritability were 0.15, 0.33 and 0.38 for body weights at birth, weaning and average daily gain from birth to weaning, respectively. The results showed that most estimates of genetic and phenotypic correlations among body weights and daily gain traits were positive.