{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T00:12:59Z","timestamp":1769127179022,"version":"3.49.0"},"reference-count":21,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2022,4,8]],"date-time":"2022-04-08T00:00:00Z","timestamp":1649376000000},"content-version":"vor","delay-in-days":97,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP16K01875"],"award-info":[{"award-number":["JP16K01875"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP20K02653"],"award-info":[{"award-number":["JP20K02653"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Pediatrics International"],"published-print":{"date-parts":[[2022,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>To examine the effects of maternal age on breast\u2010feeding, we classified mothers who delivered vaginally aged 20\u201342 into 1\u2010year age groups and investigated breast\u2010feeding states. We also studied differences between primiparas and multiparas in breast\u2010feeding.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The subjects were 2,605 primipara mothers (age at delivery ranged from 16to 45 years; the gestational age of their infants ranged from 37 to 42 weeks, birthweight ranged from 2,501 to 4,300 g) and 3,261 multipara mothers (age 18\u201345 years; the gestational age of their infants ranged from 37\u201342 weeks, and their birthweight ranged from 2,502\u20134,726 g) at 12 baby\u2010friendly hospitals in Japan.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The percentage of infants exclusively breast\u2010fed at 1\u2009week and 1\u2009month after birth in the primipara mothers was 80% among mothers in their 20s but lower than 60% among mothers aged above 35. On the other hand, the percentage of infants exclusively breast\u2010fed in the multipara mothers was almost 90% among mothers in their 20s and remained at 70% or over among mothers in their 40s. The percentage of infants exclusively breast\u2010fed was significantly higher in the multipara mothers than in the primipara mothers in many age groups at both 1\u2009week and 1\u2009month of age.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The percentage of infants exclusively breast\u2010fed rate decreased as the maternal age increased. We found that multipara mothers can breast\u2010feed even in their 40s, but primipara mothers may encounter difficulty breast\u2010feeding at ages above 35. Our results suggest a need to consider not only their age but number of children, i.e., breast\u2010feeding experience, to provide effective support to breast\u2010feeding mothers.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ped.14943","type":"journal-article","created":{"date-parts":[[2021,8,3]],"date-time":"2021-08-03T15:28:00Z","timestamp":1628004480000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Breast\u2010feeding rate comparison by parity and delivery age in Japan"],"prefix":"10.1111","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4351-5891","authenticated-orcid":false,"given":"Shigeru","family":"Nishimaki","sequence":"first","affiliation":[{"name":"Department of Pediatrics Yokohama City University Hospital Yokohama Japan"},{"name":"Japan Breastfeeding Association Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manabu","family":"Yamada","sequence":"additional","affiliation":[{"name":"Japan Breastfeeding Association Tokyo Japan"},{"name":"Department of Obstetrics and Gynecology Japanese Red Cross Medical Center Shibuya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3435-8687","authenticated-orcid":false,"given":"Takahiro","family":"Okutani","sequence":"additional","affiliation":[{"name":"Japan Breastfeeding Association Tokyo Japan"},{"name":"Department of Pediatrics Saiseikai Hyogo\u2010ken Hospital Kobe Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Madoka","family":"Hirabayashi","sequence":"additional","affiliation":[{"name":"Japan Breastfeeding Association Tokyo Japan"},{"name":"Department of Pediatrics Osaka City Juso Hospital Osaka Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Tanimura","sequence":"additional","affiliation":[{"name":"Japan Breastfeeding Association Tokyo Japan"},{"name":"Department of Obstetrics and Gynecology Toyama Prefectural Central Hospital Toyama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,4,8]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(15)01044-2"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(15)01024-7"},{"key":"e_1_2_8_4_1","unstructured":"World Health Organization.Ten steps to successful breastfeeding.https:\/\/www.who.int\/teams\/nutrition\u2010and\u2010food\u2010safety\/food-and\u2010nutrition\u2010actions\u2010in\u2010health\u2010systems\/ten\u2010steps\u2010to\u2010successful\u2010breastfeeding. 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