Objective:To explore the relationship between socioeconomic status from one side and physical growth and nutritional status from the other side,in infants versus adolescents in Egyptians.Methods:Three samples were investigated:a)A sample of 605 infants aged 6 months+1 week(287 girls and 318 boys).b)A sample of 992 infants of age 4~24 months(465 girls and 527 boys).c)A sample of 1864 children and adolescents aged 6~14 years of(744 girls and 1120 boys).All samples are from Big Cairo area of both urban and rural localities and of various socioeconomic strata.Body weight and length/height had been measured and body mass index(BMI)had been calculated for every subject.Assessment of the impact of parental education level,locality and number of sibs,on growth and nutrition as indicated by BMI was attempted.Results:a)Breastfed infants(6 months +1 week)grow bigger in low socioeconomic strata and in rural areas than artificially fed infants.The practice of breast feeding was more common and lasted longer in low socioeconomic stratum than in middle and high one.b)A significant positive association between body mass index of infants(4～24 months)and the socioeconomic status(particularly level of father education reflecting family income)was proved.c)The socioeconomic factors had insignificant influence on BMI of school children aged 6～9 years,but it showed significant influence in the period 10 ～ 14 years.After the age of 9 years,children started the pubertal stage earlier and had higher BMI in the high socioeconomic strata as compared to those of low socioeconomic strata.d)In the low socioeconomic status,breast feeding compensates the deleterious influences of the environment on growth and physique of infants.Conclusion:children of educated parents have significantly low number of siblings’ size in comparison to those of uneducated parents.Also children of educated parents are significantly more in number in urban areas than in rural areas,and vice versa.The interdependence between parental education and locality shows the highest level of significance in both sexes and at all ages. Objective: To explore the relationship between socioeconomic status from one side and physical growth and nutritional status from the other side, in infants versus adolescents in Egyptians. Methods: Three samples were investigated: a) A sample of 605 infants aged 6 months + 1 week (287 girls and 318 boys) .b) A sample of 992 infants of age 4 ~ 24 months (465 girls and 527 boys) .c) A sample of 1864 children and adolescents aged 6 ~ 14 years of (744 girls and 1120 boys All samples are from Big Cairo area of ​​both urban and rural localities and of various socioeconomic strata. Body weight and length / height had been measured and body mass index (BMI) had been calculated for every subject. Assessment of the impact of parental education level, locality and number of sibs, on growth and nutrition as indicated by BMI was attempted. Results: a) Breastfed infants (6 months + 1 week) grow bigger in low socioeconomic strata and in rural areas than artificially fed infants. of breast feeding was more common and last ed longer in low socioeconomic stratum than in middle and high one. b) A significant positive association between body mass index of infants (4 ~ 24 months) and the socioeconomic status (particularly level of father education reflecting family income) was proved.c) The socioeconomic factors had insignificant influence on BMI of school children aged 6 ~ 9 years, but it showed significant influence in the period 10 ~ 14 years. After the age of 9 years, children started the pubertal stage earlier and had higher BMI in the high socioeconomic strata as compared to those of low socioeconomic strata.d) In the low socioeconomic status, breast feeding compensates the deleterious influences of the environment on growth and physique of infants. Confc: children of educated parents have significantly low number of siblings’ size in comparison to those of uneducated parents.Also children of educated parents are significantly more in number in urban areas than in rural areas, and vice versa. interdependen ce between parental education and locality shows the highest level of significance in both sexes and at all ages.