Marked weight gain is a common finding following pediatric kidney transplantation. Despite this weight gain, their final heights are often suboptimal. In a cross-sectional design, during a 3-month period, all children and young adults that had been transplanted from the beginning of transplant program (from1993 to 2005) in Shiraz organ transplant center and had normal post transplant renal function (serum creatinine ≤1.5) were evaluated. Seventy-one children and young adults, aged 3-19 years at transplantation, were enrolled in this study. Different parameters extracted from their records and their height and weight were measured with appropriate device and body mass index was calculated, using BMI=Body weight (kg)/height (m)2 equation. Their BMIs and heights were compared with available standards.There were 45 males and 26 females. Their primary renal diseases were as follow: Glomerulopathies (n=11, 15.5%), hereditary nephropathies (n=20, 28.2%), congenital urological malformations and hypoplasia/dysplasias (n=29, 40.8%), others and unknown (n=11, 15.5%). Mean age at transplantation was 12.6+/-3.2 years (range, 3-19) with a mean follow up of 4+/-2.4 (range, 1-13) years. Sixty-nine (97.1%) of them were on triple immunosuppressive therapy (cyclosporine+ prednisolone+ cellcept or azathioprine), one was on double therapy, and one didn't use any medication. Fifty eight patients (82%) had heights below the 5th percentile of their age and sex; nine cases (12.7%) had heights between the 5th and 10th percentile and in 4 (5.6%), the height was between the 25th and 50th percentile. Regarding their body mass index, the following data was obtained: <10th percentile: 11(15%), 10-90th percentile: 53(75%), and >90th percentile: 7(10%). Height and BMI percentiles were not different significantly between the sexes. We conclude that despite acceptable BMI, growth retardation is still common among our children following kidney transplantation.