ABSTRACT
90 normal healthy infants and children [39 females and 51 males] representing various age groups from birth to 30 months were studied as regards both kidney function and size. In addition, 10 healthy adults of both sexes were included in the study as a control group. All patients were subjected to full history taking and clinical examination was done to exclude any abnormality. Laboratory investigations included blood urea, serum creatinine and creatinine clearance as a measure of glomerular filtration rate [GFR]. Sonographic examination for both right and left kidneys was done in all groups, as well as the adults. Results showed that creatinine clearance was about one third that of the adult in the neonates, especially the preterm ones and its value increases gradually with age to reach the adult level at about 2.5 years. Sonographic examination of both kidneys in all groups showed that all renal measurements [longitudinal, transverse and thickness] correlate better with weight, length and surface area than age