en Pediatric Pediatric Original Research Original Research During a historic prospective study, measurements of weight, height and head circumferences were carried out in a group of 393 Tehrani boys and girls between the first and 36th month of life and measurements were plotted over the N.C.H.S. curves. These children belonged to middle and high-class literate families who were able to understand and follow the medical advice given by their private pediatricians. Results of this study (Table I and Figs. 1-6) indicate that the trend of growth of this sample of middle and high-class Tehrani children does not differ from N.C.H.S. standards, provided that the parents understand and follow the instructions given with regards to diet, timing, and type of introduction of foods as well as hygienic and preventive measures to be taken. 237 242 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-566&slc_lang=en&sid=1 MOHAMMAD ALI NILFOROUSHAN 20031947532846005997 20031947532846005997 Yes From the Department of Pediatrics, Iran University of Medical Sciences, Tehran FARAH HASHEMI 20031947532846005998 20031947532846005998 No Pasteur Institute, Tehran HOSEIN MALEKAFZALI 20031947532846005999 20031947532846005999 No School of Public Health, Tehran University of Medical Sciences, Tehran, Islamic Republic of Iran.