Ramadan Fasting is prescribed by Holy Quran for every able-bodied, adult Muslim and is considered an essential practice for all Muslims including pregnant women. The aim of this study was to determine the effect of Ramadan fasting on neonatal anthropometric measurements during the third trimester of pregnancy. Method: This is a cross-sectional study, carried out on 300 delivering women in 2013. All participants were divided into fasting (n=150) and non-fasting (n=150) groups. Neonatal anthropometric measurements were compared in both groups. Data were then analyzed using descriptive statistics and t-test in SPSS Ver. 11.5 at a significant level of 5%. Results: There were no significant differences between the two groups in the birth weight (p=0.97), head circumference (p=0.09) and height (p=0.12) of the neonates. Also, the prevalence of LBW was similar in fasting and non-fasting groups (p=0.33). Conclusion: Ramadan fasting in the third trimester of pregnancy has no adverse effects on neonatal anthropometric measurements.