Fontanel Size from Birth to 24 Months of Age in Iranian Children

Diagnosis of abnormal fontanel size, a potential clue to recognition of ifferent disorders, requires an understanding of the wide variation of normal fontanel ize. The anterior fontanel is the largest, prominent and most important for clinical valuation. The aim of this study was to establish and define normal range of fontanel ize from birth to 24 months of age in healthy Iranian children that might be generalized o other populations.Totally, 550 subjects enrolled randomly in this cross sectional study. hey were apparently normal healthy children, from birth to 24 months of age, including 08-term newborn and 342 infant from birth to 2 yr old. Fontanel size was measured and ecorded as the mean of the length (anterior- posterior dimension) and width (transverse imension). Mean anterior fontanel sizes in our samples were classified for periods of 3 onths. Nomograms and statistical analyses were performed and depicted by Excel icrosoft Office 2007 and two-tailed t-test respectively.The mean ±2SD of anterior fontanel size was 2.55±1.92 cm in newborns, 3.37±2.48 (largest size) in 3 months of age. It was closed in all cases in 15-18 months of age. The mean posterior fontanel size was 0.8 cm in newborns and closed in all infants in 2 months of age. There was no significant difference in anterior fontanel size between two genders except in newborn and 6-9 months old (P>0.05).Abnormal fontanel can indicate a serious medical condition. Therefore, it is important to understand normal variations, to utilize standardized techniques for measurement and appropriate standards of normal range in different age groups and populations. This study provides a normal range of mean fontanel size in Iranian infants as a local reference. It might be generalized to other populations.