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Fetal movement patterns were assessed from real\u2010time ultrasound recordings performed at 12\u201015, 20\u201023, and 28\u201032\u00a0weeks of gestation in 42 twin pairs. Results indicated that both general movements and breathing movements followed a curvilinear, inverted U\u2010shaped curve. Developmental trajectories were unrelated within pairs of twins and were not associated with gestational age at birth and birth weight. However, sex differences were found for general movements with males displaying more time making general movements at 21\u00a0weeks and a steeper decline in time spent making general movements during the second half of pregnancy than females. These age\u2010related changes in fetal movements may reflect CNS development. These findings also suggest that twins\u2019 behavioral development is largely independent of co\u2010twin development, gestational age at birth, and birth weight, but not of fetal sex.<\/jats:p>","DOI":"10.1002\/dev.21846","type":"journal-article","created":{"date-parts":[[2019,4,3]],"date-time":"2019-04-03T14:30:54Z","timestamp":1554301854000},"page":"626-633","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Developmental trajectories of general and breathing movements in fetal twins"],"prefix":"10.1002","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4246-8133","authenticated-orcid":false,"given":"Iva","family":"Tendais","sequence":"first","affiliation":[{"name":"Department of Applied Psychology School of Psychology, University of Minho Braga Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B\u00e1rbara","family":"Figueiredo","sequence":"additional","affiliation":[{"name":"Department of Applied Psychology School of Psychology, University of Minho Braga Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eduard J.H.","family":"Mulder","sequence":"additional","affiliation":[{"name":"Department of Perinatology and Gynecology Wilhelmina Children\u2019s Hospital, University Medical Centre Utrecht Utrecht The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dulcina","family":"Lopes","sequence":"additional","affiliation":[{"name":"Hospital Pedro Hispano, ULS de Matosinhos Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nuno","family":"Montenegro","sequence":"additional","affiliation":[{"name":"EPIUnit \u2010 Instituto de Sa\u00fade P\u00fablica Universidade do Porto Porto Portugal"},{"name":"Faculdade de Medicina Universidade do Porto Porto Portugal"},{"name":"Department of Obstetrics and Gynecology of Centro Hospitalar de S\u00e3o Jo\u00e3o Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,4,3]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1515\/jpm-2017-0158"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/dev.1019"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2013.09.004"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0028-2243(78)90006-0"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(84)90772-5"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0013199"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.3109\/01674821003681464"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0378-3782(01)00224-9"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.2740"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.3917"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(82)90033-0"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(85)90174-4"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(88)90089-8"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/jp.2008.238"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1037\/0012-1649.40.3.445"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1467-8624.1996.tb01874.x"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.physa.2007.08.021"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1515\/jpm-2015-0387"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ultrasmedbio.2011.06.005"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.3109\/14767058.2011.568551"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1037\/0012-1649.44.2.316"},{"key":"e_1_2_7_23_1","volume-title":"Dyadic data analysis","author":"Kenny D. 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