Journal of Research in Medical Sciences1735-1995233201803191072510725EN20171115<span class="fontstyle0">Background: </span><span class="fontstyle2">According to increasing rate of using assisted reproductive technology (ART) which result in higher rates of multiple birth and natal difculties, we aimed to determine the prevalence rate of multiple birth pregnancies. </span><span class="fontstyle0" style="color: #231f20;">Materials and Methods: </span><span class="fontstyle2">A descriptive cross?sectional study evaluating birth fles in 2009–2010 of main hospitals of Isfahan, Iran. </span><span class="fontstyle0">Results: </span><span class="fontstyle2">Among 31640 fles’ studies, 614 cases of multiple birth pregnancies were investigated. Te product of these pregnancies were 1286 (50.2% females) infants including 557 twins (17.6/1000), 56 triplets (1.8/1000), and one case of quadruple (0.03/1000). Infants weigh &lt;2500 g were 84.9% of<br />all. Mothers had a mean age of 27.9 ± 4.9 which 30.4% of them had a positive history of using ART. </span><span class="fontstyle0" style="color: #231f20;">Discussion: </span><span class="fontstyle2">Te prevalence of multiple birth pregnancies is growing. Te need for more mother and child care is important.<br /></span> <br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px;" />http://jrms.mui.ac.ir/index.php/jrms/article/view/10725http://jrms.mui.ac.ir/index.php/jrms/article/download/10725/5604