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Exclusive breastfeeding rates were 74%, 72%, and 35% at 1, 3, and 6 months, respectively. At 3 months, lower maternal education, greater breastfeeding frequency (day 3), greater breast pain (day 3), and depot medroxyprogesterone acetate use (3 months) were associated with EBF, after adjusting for EBF intentions. At 6 months, greater infant birth weight and mother\u2013not employed were associated with EBF, after controlling for EBF intentions. More educated and working mothers, and infants with lower birth weight should be targeted in interventions to promote EBF in urban Peru. Research is also warranted to explore the factors linking depot medroxyprogesterone acetate use and breast pain with EBF duration.<\/jats:p>","DOI":"10.1177\/0890334411422703","type":"journal-article","created":{"date-parts":[[2011,11,5]],"date-time":"2011-11-05T00:33:41Z","timestamp":1320453221000},"page":"45-54","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":27,"title":["Determinants of Exclusive Breastfeeding in a Cohort of Primiparous Periurban Peruvian Mothers"],"prefix":"10.1177","volume":"28","author":[{"given":"Susana L.","family":"Matias","sequence":"first","affiliation":[{"name":"Department of Nutrition, University of California, Davis, California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laurie A.","family":"Nommsen-Rivers","sequence":"additional","affiliation":[{"name":"Division of Neonatology, Cincinnati Children\u2019s Hospital, Cincinnati, Ohio"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kathryn G.","family":"Dewey","sequence":"additional","affiliation":[{"name":"Department of Nutrition, University of California, Davis, California"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2011,11,4]]},"reference":[{"key":"bibr1-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.299.6705.946"},{"key":"bibr2-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.300.6716.11"},{"key":"bibr3-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(00)82011-5"},{"key":"bibr4-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.323.7308.303"},{"key":"bibr5-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(07)61690-0"},{"key":"bibr6-0890334411422703","doi-asserted-by":"crossref","first-page":"2765","DOI":"10.1093\/jn\/126.11.2765","volume":"126","author":"Perez-Escamilla R","year":"1996","journal-title":"J Nutr"},{"key":"bibr7-0890334411422703","doi-asserted-by":"crossref","first-page":"2972","DOI":"10.1093\/jn\/125.12.2972","volume":"125","author":"Perez-Escamilla R","year":"1995","journal-title":"J Nutr"},{"key":"bibr8-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1007\/BF03403610"},{"key":"bibr9-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2431-10-20"},{"key":"bibr10-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/156482651003100220"},{"key":"bibr11-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/1090198107303307"},{"key":"bibr12-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1111\/j.1651-2227.2005.tb02093.x"},{"key":"bibr13-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1590\/S1020-49892002000900007"},{"key":"bibr14-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1590\/S0036-36342003001000004"},{"key":"bibr15-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2431-3-5"},{"key":"bibr16-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/0890334403252537"},{"key":"bibr17-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/089033440101700305"},{"key":"bibr18-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1002\/nur.20275"},{"key":"bibr19-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/0890334403253292"},{"key":"bibr20-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/089033402237906"},{"key":"bibr21-0890334411422703","doi-asserted-by":"publisher","DOI":"10.1177\/089033449901500207"},{"key":"bibr22-0890334411422703","volume-title":"Peru: Encuesta demografica y de salud familiar. 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