{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T09:19:46Z","timestamp":1787908786512,"version":"build-2784847793"},"reference-count":37,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T00:00:00Z","timestamp":1787875200000},"content-version":"vor","delay-in-days":239,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Pregnancy"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>Vitamin D plays a crucial role in maternal and infant health. This study was aimed at evaluating and comparing serum vitamin D levels and clinical outcomes between preterm mothers who received vitamin D supplements and those who did not.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>In a cross\u2010sectional study, a total of 328 women were enrolled, of whom 310 mother\u2013infant pairs were included in the final analysis. The supplementation group consisted of mothers who consumed at least 1000 international units of vitamin D daily for a minimum of 1 month prior to delivery. Clinical characteristics and neonatal outcomes were compared between the supplementation and nonsupplementation cohorts.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The mean serum vitamin D levels were significantly higher in the supplementation group for both mothers (23.88 \u00b1 15.66 vs. 12.68 \u00b1 7.37 ng\/mL) and their infants (17.55 \u00b1 12.23 vs. 10.38 \u00b1 7.35 ng\/mL; p &lt;0.001 for both). Infants in the nonsupplementation group required resuscitation in the delivery room significantly more often (p = 0.019). Furthermore, the incidence of respiratory distress syndrome (p = 0.002) and respiratory problems (p = 0.004) were significantly higher in the nonsupplemented group. No statistically significant differences were observed regarding one\u2010 and fifth\u2010minute Apgar scores (p = 0.200 and p = 0.117), birth weight (p = 0.343), or neonatal mortality (p = 0.062).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Maternal vitamin D supplementation is associated with higher serum vitamin D levels in both mothers and preterm infants, as well as a reduced prevalence of adverse neonatal respiratory outcomes. These findings underscore the clinical importance of prenatal vitamin D supplementation to promote maternal and neonatal health, particularly in populations with high rates of vitamin D deficiency.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1155\/jp\/8348907","type":"journal-article","created":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T08:41:14Z","timestamp":1787906474000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Serum Vitamin D Levels in Pregnant Women: The Role of Supplementation on Preterm Infant Outcomes"],"prefix":"10.1155","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6543-9095","authenticated-orcid":false,"given":"Maryam","family":"Zakerihamidi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9000-8051","authenticated-orcid":false,"given":"Forough","family":"Rakhshanizadeh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7413-6945","authenticated-orcid":false,"given":"Fahimeh","family":"Afzaljavan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4022-5426","authenticated-orcid":false,"given":"Hassan","family":"Boskabadi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,28]]},"reference":[{"key":"e_1_2_16_1_2","article-title":"Effects of Vitamin D and Calcium Intake on Serum Bone Markers at Delivery","volume":"8","author":"Sabour H.","year":"2007","journal-title":"Journal of Reproduction & Infertility"},{"key":"e_1_2_16_2_2","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.f1169"},{"key":"e_1_2_16_3_2","doi-asserted-by":"publisher","DOI":"10.1093\/bmb\/ldy010"},{"key":"e_1_2_16_4_2","doi-asserted-by":"publisher","DOI":"10.22038\/ijp.2016.6756"},{"key":"e_1_2_16_5_2","doi-asserted-by":"publisher","DOI":"10.29252\/ijrm.16.7.429"},{"key":"e_1_2_16_6_2","first-page":"32","article-title":"Comparison of Vitamin D Level in Preterm and Term Infant\u2013Mother Pairs: A Brief Study","volume":"7","author":"Fallahi M.","year":"2016","journal-title":"Iranian Journal of Neonatology"},{"key":"e_1_2_16_7_2","doi-asserted-by":"publisher","DOI":"10.17925\/EE.2013.09.02.125"},{"key":"e_1_2_16_8_2","doi-asserted-by":"publisher","DOI":"10.3390\/nu7010443"},{"key":"e_1_2_16_9_2","doi-asserted-by":"publisher","DOI":"10.4274\/jcrpe.4706"},{"key":"e_1_2_16_10_2","doi-asserted-by":"publisher","DOI":"10.1177\/19345798251324441"},{"key":"e_1_2_16_11_2","doi-asserted-by":"publisher","DOI":"10.3310\/hta18450"},{"key":"e_1_2_16_12_2","first-page":"832","article-title":"Maternal-Fetal Calcium and Bone Metabolism During Pregnancy, Puerperium, and Lactation","volume":"18","author":"Kovacs C. 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