{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T22:50:18Z","timestamp":1789080618107,"version":"build-2803163510"},"reference-count":31,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2022,3,15]],"date-time":"2022-03-15T00:00:00Z","timestamp":1647302400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100017661","name":"China Health Promotion Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100017661","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Endocrinol."],"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>The purpose of this study was to clarify the influence of the vanishing twin (VT) on the perinatal outcomes in the surviving singleton and further identify the susceptible window.<\/jats:p><\/jats:sec><jats:sec><jats:title>Study design<\/jats:title><jats:p>Retrospective cohort study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 636 survivors of a vanished co-twin and 11,148 singleton controls were enrolled. The exposed group was further divided into early VT (EVT, VT \u226413 weeks, N = 593) and late VT subgroups (LVT, VT &amp;gt;13 weeks, N = 43) according to the gestational age of the twin vanishing. All participants were conceived through <jats:italic>in vitro<\/jats:italic> fertilization (IVF). Perinatal outcomes including gestational age, birthweight, and the incidence of preterm birth (PTB), low birthweight (LBW), small for gestational age (SGA), neonatal intensive care unit (NICU) admission, umbilical cord abnormality, jaundice of the newborn, and oligohydramnios were compared among the groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In our birth cohort, about 5.4% of all singleton deliveries originated from vanishing twin\u00a0pregnancies. Compared with the singletons, both early and late VT\u00a0pregnancy had a significantly lower birth weight (3337.57\u00b1532.24 g and 2916.05\u00b1526.07 g vs. 3446.15\u00b1526.07 g; p &amp;lt; 0.001 and p &amp;lt; 0.001), more frequent neonatal jaundice (47.0% and 60.5% vs. 40.6%; p = 0.002 and p = 0.008), and decreased incidence of umbilical cord abnormality (15.5% and 7.0% vs. 19.9%; p = 0.009 and p = 0.034). Newborns in the early VT group were more likely to manifest as SGA (5.4% vs. 3.6%, p = 0.002) and suffered oligohydramnios (5.4% vs. 3.4%; p\u00a0= 0.008) than the primary singletons. In addition, the gestational age of late VT survivors was shorter than that of the controls (37.25 \u00b1 3.25 vs. 39.04 \u00b1 1.63, p = 0.001) and had a significantly higher risk of PTB (30.2% vs. 6.6%; p &amp;lt; 0.001) and NICU admission (27.9% vs. 9.4%, p &amp;lt; 0.001). All differences except for SGA maintain significance after adjusting for maternal age, BMI, and parity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Singletons with a vanished co-twin had worse perinatal outcomes compared with the original singletons, with LVT burden even much on the survival one. Therefore, close monitoring during the perinatal period was suggested in this type of neonates. Moreover, elective single embryo transfer should also be fully considered which could tackle the problem at its root.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fendo.2022.832665","type":"journal-article","created":{"date-parts":[[2022,3,15]],"date-time":"2022-03-15T08:51:44Z","timestamp":1647334304000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":11,"title":["The Influence of the Vanishing Twin on the Perinatal Outcome of Surviving Singleton in IVF 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