{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T15:43:32Z","timestamp":1785426212994,"version":"3.56.0"},"reference-count":44,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T00:00:00Z","timestamp":1785110400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Royal Brisbane Women\u2019s Hospital Foundation PhD scholarship"},{"id":[{"id":"https:\/\/ror.org\/01zbzxe52","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Metro North Health Clinician Research Fellowship","award":["CRF-509-2023"],"award-info":[{"award-number":["CRF-509-2023"]}]},{"award":["CRF-509-2023"],"award-info":[{"award-number":["CRF-509-2023"]}],"id":[{"id":"https:\/\/ror.org\/03a0hqz22","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Clin. Med.","JCM"],"abstract":"<jats:p>Background\/Objectives: Consensus guidelines recommend delaying conception for at least 12 months following bariatric surgery to achieve maternal weight stability; however, the impact this has on perinatal outcomes is poorly understood. The aim of this study was to explore the impact of bariatric surgery-to-conception interval and maternal preconception weight change on birth weight and gestational age at birth. Methods: Women aged 18\u201345 years with singleton pregnancies after bariatric surgery were recruited to a prospective, observational study before 23 weeks\u2019 gestation. Participants self-reported the surgery-to-conception interval and weight change in the six months before conception. Preconception weight change was calculated as a percentage of difference compared to weight at conception. Linear regression assessed predictors of birth weight and gestational age. Results: Data from 68 participants (mean age 32 \u00b1 4.8 years) were analyzed. The median birth weight was 3368 (514) g with 7% (5\/68) SGA infants. Women with SGA infants had greater preconception weight loss (12% vs. 0%, p = 0.029), while surgery-to-conception intervals were similar (p = 0.255). Preconception weight change and gestational age were independent predictors of birth weight (p &lt; 0.001), accounting for 58% of its variance. Surgery-to-conception interval did not predict birth weight (p = 0.986). The median gestational age at birth was 39 (2.1) weeks, with 7% (5\/68) preterm births. Neither preconception weight change nor surgery-to-conception interval predicted gestational age at birth. Conclusions: Preconception weight change appears to be more influential than surgery-to-conception interval for birth weight and birth of an SGA infant. This suggests a need for individualized counseling regarding timing of pregnancy after bariatric surgery.<\/jats:p>","DOI":"10.3390\/jcm15155851","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T09:47:41Z","timestamp":1785145661000},"page":"5851","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Preconception Weight Change and Pregnancy Outcomes After Bariatric Surgery"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6670-0566","authenticated-orcid":false,"given":"Taylor","family":"Guthrie","sequence":"first","affiliation":[{"name":"Faculty of Health, Medicine & Behavioural Sciences, University of Queensland, Herston, QLD 4029, Australia"},{"name":"Dietetics & Foodservices, Royal Brisbane Women\u2019s Hospital, Herston, QLD 4029, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandra","family":"Lee","sequence":"additional","affiliation":[{"name":"Maternity Services, Caboolture Hospital, Caboolture, QLD 4510, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9816-3734","authenticated-orcid":false,"given":"Alka","family":"Kothari","sequence":"additional","affiliation":[{"name":"Faculty of Health, Medicine & Behavioural Sciences, University of Queensland, Herston, QLD 4029, Australia"},{"name":"Obstetrics & Gynecology, Redcliffe Hospital, Redcliffe, QLD 4020, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Pinzon Perez","sequence":"additional","affiliation":[{"name":"Queensland Cyber Infrastructure Foundation, Fortitude Valley, QLD 4006, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0832-4811","authenticated-orcid":false,"given":"Sailesh","family":"Kumar","sequence":"additional","affiliation":[{"name":"Faculty of Health, Medicine & Behavioural Sciences, University of Queensland, Herston, QLD 4029, Australia"},{"name":"Mater Research Institute, University of Queensland, Brisbane, QLD 4072, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1992-1649","authenticated-orcid":false,"given":"Helen","family":"Truby","sequence":"additional","affiliation":[{"name":"Faculty of Health, Medicine & Behavioural Sciences, University of Queensland, Herston, QLD 4029, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6321-8558","authenticated-orcid":false,"given":"Susan","family":"de Jersey","sequence":"additional","affiliation":[{"name":"Faculty of Health, Medicine & Behavioural Sciences, University of Queensland, Herston, QLD 4029, Australia"},{"name":"Dietetics & Foodservices, Royal Brisbane Women\u2019s Hospital, Herston, QLD 4029, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Akhter, Z., Rankin, J., Ceulemans, D., Ngongalah, L., Ackroyd, R., Devlieger, R., Vieira, R., and Heslehurst, N. (2019). Pregnancy after bariatric surgery and adverse perinatal outcomes: A systematic review and meta-analysis. PLoS Med., 16.","DOI":"10.1371\/journal.pmed.1002866"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1921","DOI":"10.1016\/j.jand.2019.02.008","article-title":"Effects of Bariatric Surgery on Maternal and Infant Outcomes of Pregnancy\u2014An Evidence Analysis Center Systematic Review","volume":"119","author":"Hakeem","year":"2019","journal-title":"J. Acad. Nutr. Diet."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"573","DOI":"10.1016\/j.ajog.2018.02.003","article-title":"Maternal and neonatal outcomes after bariatric surgery; a systematic review and meta-analysis: Do the benefits outweigh the risks?","volume":"218","author":"Kwong","year":"2018","journal-title":"Am. J. Obstet. Gynecol."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Ja\u0144czewska, I., Wierzba, J., Ja\u0144czewska, A., Szczurek-Gierczak, M., and Dom\u017calska-Popadiuk, I. (2023). Prematurity and Low Birth Weight and Their Impact on Childhood Growth Patterns and the Risk of Long-Term Cardiovascular Sequelae. Children, 10.","DOI":"10.3390\/children10101599"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1507","DOI":"10.1111\/obr.12927","article-title":"Pregnancy after bariatric surgery: Consensus recommendations for periconception, antenatal and postnatal care","volume":"20","author":"Shawe","year":"2019","journal-title":"Obes. Rev."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"582","DOI":"10.1111\/apt.12872","article-title":"Review article: The nutritional and pharmacological consequences of obesity surgery","volume":"40","author":"Stein","year":"2014","journal-title":"Aliment. Pharmacol. Ther."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"2266","DOI":"10.1007\/s11695-020-04465-9","article-title":"Impact of Postprandial Hypoglycemia on Weight Loss After Bariatric Surgery","volume":"30","author":"Rebelos","year":"2020","journal-title":"Obes. Surg."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Szczuko, M., Szabunia, N., Radkiewicz, J., Jamio\u0142-Milc, D., Macha\u0142owski, T., and Zi\u0119tek, M. (2025). Relationship of SCFAs to Maternal and Child Anthropometric Measurements. Int. J. Mol. Sci., 26.","DOI":"10.3390\/ijms26136424"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"940","DOI":"10.1007\/s11695-016-2400-0","article-title":"Body Weight Reduction and Biochemical Parameters of the Patients After RYGB and SG Bariatric Procedures in 12-Month Observation","volume":"27","author":"Szczuko","year":"2017","journal-title":"Obes. Surg."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/j.soard.2019.10.025","article-title":"Clinical practice guidelines for the perioperative nutrition, metabolic, and nonsurgical support of patients undergoing bariatric procedures\u20142019 update: Cosponsored by American Association of Clinical Endocrinologists\/American College of Endocrinology, The Obesity Society, American Society for Metabolic & Bariatric Surgery, Obesity Medicine Association, and American Society of Anesthesiologists","volume":"16","author":"Mechanick","year":"2020","journal-title":"Surg. Obes. Relat. Dis."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"e13087","DOI":"10.1111\/obr.13087","article-title":"British Obesity and Metabolic Surgery Society Guidelines on perioperative and postoperative biochemical monitoring and micronutrient replacement for patients undergoing bariatric surgery\u20142020 Update","volume":"21","author":"Parretti","year":"2020","journal-title":"Obes. Rev."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"4168541","DOI":"10.1155\/2017\/4168541","article-title":"Maternal Nutritional Deficiencies and Small-for-Gestational-Age Neonates at Birth of Women Who Have Undergone Bariatric Surgery","volume":"2017","author":"Hazart","year":"2017","journal-title":"J. Pregnancy"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"762","DOI":"10.1016\/j.amjsurg.2006.08.041","article-title":"Pregnancy outcomes after gastric-bypass surgery","volume":"192","author":"Dao","year":"2006","journal-title":"Am. J. Surg."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"e2346228","DOI":"10.1001\/jamanetworkopen.2023.46228","article-title":"Pregnancy Weight Gain After Gastric Bypass or Sleeve Gastrectomy","volume":"6","author":"Xu","year":"2023","journal-title":"JAMA Netw. Open"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1795","DOI":"10.1016\/j.soard.2018.09.485","article-title":"The effect of surgery-to-conception interval on pregnancy outcomes after sleeve gastrectomy","volume":"14","author":"Rottenstreich","year":"2018","journal-title":"Surg. Obes. Relat. Dis."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1182","DOI":"10.1080\/14767058.2016.1208746","article-title":"Pregnancy and perinatal outcomes according to surgery to conception interval and gestational weight gain in women with previous gastric bypass","volume":"30","author":"Stentebjerg","year":"2017","journal-title":"J. Matern. Fetal. Neonatal. Med."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"104333","DOI":"10.1016\/j.midw.2025.104333","article-title":"Pregnant women\u2019s experiences of nutrition care after previous bariatric surgery","volume":"143","author":"Guthrie","year":"2025","journal-title":"Midwifery"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1093\/ajcn\/nqz046","article-title":"Intuitive eating is associated with weight loss after bariatric surgery in women","volume":"110","author":"Molinari","year":"2019","journal-title":"Am. J. Clin. Nutr."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"219","DOI":"10.20344\/amp.11057","article-title":"Advanced Maternal Age: Adverse Outcomes of Pregnancy, A Meta-Analysis","volume":"32","author":"Pinheiro","year":"2019","journal-title":"Acta Med. Port."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Guthrie, T.M., Lee, S., Kothari, A., Kumar, S., Truby, H., and de Jersey, S. (2025). Measuring Dietary Intake of Pregnant Women Post-Bariatric Surgery: Do Women Meet Recommendations?. Nutrients, 17.","DOI":"10.3390\/nu17020285"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Guthrie, T.M., Lee, S., Kothari, A., Pinzon Perez, W., Kumar, S., Truby, H., and de Jersey, S. (2025). Weight Gain During Pregnancy Following Bariatric Surgery: Exploring the Influence of Weight Stability and Surgery-to-Conception Interval. J. Clin. Med., 14.","DOI":"10.3390\/jcm14134666"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2191","DOI":"10.1007\/s11695-026-08576-7","article-title":"Micronutrient Deficiency During Pregnancy After Bariatric Surgery: The Role of Micronutrient Supplements and Dietary Intake","volume":"36","author":"Guthrie","year":"2026","journal-title":"Obes. Surg."},{"key":"ref_23","unstructured":"(2020). Queensland Clinical Guidelines, Obesity in Pregnancy (Including Bariatric Surgery)."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1123","DOI":"10.1016\/j.soard.2017.02.029","article-title":"Definition determines weight regain outcomes after sleeve gastrectomy","volume":"13","author":"Lauti","year":"2017","journal-title":"Surg. Obes. Relat. Dis."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"e23951","DOI":"10.1002\/ajhb.23951","article-title":"Changes in body weight and body composition during the menstrual cycle","volume":"35","author":"Kanellakis","year":"2023","journal-title":"Am. J. Hum. Biol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"870","DOI":"10.1111\/obr.12222","article-title":"Impact of weight cycling on risk of morbidity and mortality","volume":"15","author":"Mehta","year":"2014","journal-title":"Obes. Rev."},{"key":"ref_27","unstructured":"Institute of Medicine (2009). Weight Gain During Pregnancy: Reexamining the Guidelines, National Academic Press."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Fenton, T.R., and Kim, J.H. (2013). A systematic review and meta-analysis to revise the Fenton growth chart for preterm infants. BMC Pediatr., 13.","DOI":"10.1186\/1471-2431-13-59"},{"key":"ref_29","unstructured":"Australian Institute of Health and Welfare (2025, June 06). Australia\u2019s Mothers and Babies, Available online: https:\/\/www.aihw.gov.au\/reports\/mothers-babies\/australias-mothers-babies\/contents\/baby-outcomes\/gestational-age."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"979","DOI":"10.1007\/s11695-021-05800-4","article-title":"Early Pregnancy (\u226412 Months) After Bariatric Surgery: Does It Really Influence Maternal and Perinatal Outcomes?","volume":"32","author":"Chen","year":"2022","journal-title":"Obes. Surg."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1857","DOI":"10.1007\/s11695-023-06565-8","article-title":"A Systematic Review Investigating Maternal Nutrition During Pregnancy After Bariatric Surgery","volume":"33","author":"Guthrie","year":"2023","journal-title":"Obes. Surg."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"343","DOI":"10.1007\/s00404-022-06480-w","article-title":"Risk factors of lower birth weight, small-for-gestational-age infants, and preterm birth in pregnancies following bariatric surgery: A scoping review","volume":"307","author":"Yu","year":"2023","journal-title":"Arch. Gynecol. Obstet."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"2072","DOI":"10.1007\/s11695-020-05219-3","article-title":"A Matter of Timing-Pregnancy After Bariatric Surgery","volume":"31","author":"Heusschen","year":"2021","journal-title":"Obes. Surg."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1001\/jamasurg.2016.3621","article-title":"Bariatric Surgery in Women of Childbearing Age, Timing Between an Operation and Birth, and Associated Perinatal Complications","volume":"152","author":"Parent","year":"2017","journal-title":"JAMA Surg."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"e018778","DOI":"10.1136\/bmjopen-2017-018778","article-title":"Interpregnancy weight change and adverse pregnancy outcomes: A systematic review and meta-analysis","volume":"8","author":"Mononen","year":"2018","journal-title":"BMJ Open"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Mousa, A., Naqash, A., and Lim, S. (2019). Macronutrient and Micronutrient Intake during Pregnancy: An Overview of Recent Evidence. Nutrients, 11.","DOI":"10.3390\/nu11020443"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1001\/jamasurg.2017.5025","article-title":"Seven-Year Weight Trajectories and Health Outcomes in the Longitudinal Assessment of Bariatric Surgery (LABS) Study","volume":"153","author":"Courcoulas","year":"2018","journal-title":"JAMA Surg."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"3508","DOI":"10.1007\/s11695-019-04009-w","article-title":"Analysis of Medium-Term Weight Regain 5 Years After Laparoscopic Sleeve Gastrectomy","volume":"29","author":"Bakr","year":"2019","journal-title":"Obes. Surg."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1111\/aogs.12029","article-title":"Effectiveness of interventions for the prevention of small-for-gestational age fetuses and perinatal mortality: A review of systematic reviews","volume":"92","author":"Morris","year":"2013","journal-title":"Acta Obstet. Gynecol. Scand."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"314","DOI":"10.1111\/ppe.12286","article-title":"Validity of Self-Reported Pre-Pregnancy Weight and Body Mass Index Classification in an Integrated Health Care Delivery System","volume":"30","author":"Han","year":"2016","journal-title":"Paediatr. Perinat. Epidemiol."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"350","DOI":"10.1111\/obr.12486","article-title":"The accuracy of self-reported pregnancy-related weight: A systematic review","volume":"18","author":"Headen","year":"2017","journal-title":"Obes. Rev."},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Rangel Bousquet Carrilho, T., Rasmussen, K.M., Rodrigues Farias, D., Freitas Costa, N.C., Ara\u00fajo Batalha, M., Reichenheim, M.E., Ohuma, E.O., Hutcheon, J.A., and Kac, G. (2020). Agreement between self-reported pre-pregnancy weight and measured first-trimester weight in Brazilian women. BMC Pregnancy Childbirth, 20.","DOI":"10.1186\/s12884-020-03354-4"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1242","DOI":"10.1007\/s10995-021-03149-9","article-title":"Bias in Self-reported Prepregnancy Weight Across Maternal and Clinical Characteristics","volume":"25","author":"Sharma","year":"2021","journal-title":"Matern. Child Health J."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"485.e1","DOI":"10.1016\/j.ajog.2024.08.044","article-title":"Pregnancy and offspring outcomes after prepregnancy bariatric surgery","volume":"232","author":"Griffin","year":"2025","journal-title":"Am. J. Obstet. Gynecol."}],"container-title":["Journal of Clinical Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-0383\/15\/15\/5851\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T10:09:07Z","timestamp":1785146947000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-0383\/15\/15\/5851"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,7,27]]},"references-count":44,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2026,8]]}},"alternative-id":["jcm15155851"],"URL":"https:\/\/doi.org\/10.3390\/jcm15155851","relation":{},"ISSN":["2077-0383"],"issn-type":[{"value":"2077-0383","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,7,27]]}}}