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Psychological factors influence breastfeeding behaviours in the general population, but their role is not yet understood in women with a BMI \u226530\u00a0kg\u00a0m<jats:sup>\u22122<\/jats:sup>. Therefore, this review aimed to systematically search and synthesize the literature, which has investigated the association between any psychological factor and breastfeeding behaviour in women with a BMI \u226530\u00a0kg\u00a0m<jats:sup>\u22122<\/jats:sup>. The search identified 20 eligible papers, reporting 16 psychological factors. Five psychological factors were associated with breastfeeding behaviours: intentions to breastfeed, belief in breast milk's nutritional adequacy and sufficiency, belief about other's infant feeding preferences, body image and social knowledge. It is therefore recommended that current care should encourage women to plan to breastfeed, provide corrective information for particular beliefs and address their body image and social knowledge. Recommendations for future research include further exploration of several psychological factors (i.e. expecting that breastfeeding will enhance weight loss, depression, anxiety and stress) and evidence and theory\u2010based intervention development.<\/jats:p>","DOI":"10.1111\/obr.12681","type":"journal-article","created":{"date-parts":[[2018,3,24]],"date-time":"2018-03-24T08:26:07Z","timestamp":1521879967000},"page":"947-959","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":44,"title":["The association between psychological factors and breastfeeding behaviour in women with a body mass index (BMI) \u226530\u00a0kg\u00a0m<sup>\u22122<\/sup>: a systematic review"],"prefix":"10.1111","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0416-8938","authenticated-orcid":false,"given":"S.","family":"Lyons","sequence":"first","affiliation":[{"name":"Manchester Centre for Health Psychology, Division of Psychology and Mental Health, School of Health Sciences, Faculty of Biology, Medicine and Health The University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Currie","sequence":"additional","affiliation":[{"name":"Department of Psychology, Faculty of Natural Sciences University of Stirling  Stirling UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Peters","sequence":"additional","affiliation":[{"name":"Manchester Centre for Health Psychology, Division of Psychology and Mental Health, School of Health Sciences, Faculty of Biology, Medicine and Health The University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T.","family":"Lavender","sequence":"additional","affiliation":[{"name":"Centre for Global Women's Health, Division of Nursing, Midwifery and Social Work, Faculty of Biology, Medicine and Health The University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. 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