S. Ip, M. Chung, G. Raman, P. Chew, N. Magula et al., Breastfeeding and Maternal and 418 Infant Health Outcomes in Developed CountriesPrepared by Tufts-New England Medical Center Evidence-based Practice Center, 420 under Contract No. 290-02-0022), Agency for Healthcare Research and 421 Quality, p.422, 2007.

A. Nationale-d, Accréditation et d' Evaluation en Santé. [Breast feeding: implementation and 426 continuation through the first six months of life, Recommendations Obstet Fertil, vol.31, issue.5, pp.481-90, 2002.

J. Zeitlin, A. Mohangoo, . Euro-peristat, . Project, . Scpe et al., 429 European Perinatal Health Report, 2008.

B. Hamlyn, S. Brooker, K. Oleinikova, and S. Wands, Infant Feeding: The 433 Stationery Office, 2000.

K. Bolling, C. Grant, B. Hamlyn, and A. Thornton, Infant Feeding Survey: The 435 Information Centre Part of the Government Statistical Service, p.436, 2005.

M. Giovannini, G. Banderali, G. Radaelli, C. V. Riva, E. Agostoni et al., Monitoring breastfeeding rates in Italy: national surveys 1995 and 1999, Acta Paediatrica, vol.4, issue.Suppl, pp.357-438, 2003.
DOI : 10.1111/j.1651-2227.2003.tb00559.x

G. Singh, M. Kogan, and D. Dee, Nativity/immigrant status, race/ethnicity, and socioeconomic 440 determinants of breastfeeding initiation and duration in the United States, Pediatrics, vol.441119, issue.1, pp.38-46, 2003.

R. Li, N. Darling, M. E. Barker, L. Grummer-strawn, and L. , Breastfeeding rates in the United 443 States by characteristics of the child, mother, or family: the 2002 National Immunization 444 Survey, Pediatrics, vol.115, issue.1, pp.31-38, 2005.

S. Donath and L. Amir, Rates of breastfeeding in Australia by State and socio-economic status: Evidence from the 1995 National Health Survey, Journal of Paediatrics and Child Health, vol.23, issue.2, pp.164-172, 2000.
DOI : 10.1046/j.1440-1754.2000.00486.x

B. Blondel, K. Supernant, C. Du-mazaubrun, and G. Bréart, Enquête nationale périnatale 2003 : 450 situation en 2003 et évolution depuis 1998, p.453, 2005.

S. Hercberg and P. Éléments-de-bilan-du, Pour une grande mobilisation nationale de tous les acteurs 455 pour la promotion de la nutrition en France, ) et propositions de nouvelles stratégies 454 pour le PNNS2: Ministère de la Santé et des Solidarités, pp.282-457, 2001.

A. Yngve and M. Sjostrom, Breastfeeding determinants and a suggested framework for action in 458

M. Bentley, D. Dee, and J. Jensen, Breastfeeding among low income, African-American women: 460 power, beliefs and decision making, J Nutr, vol.133, issue.1, pp.305-309, 2003.

I. Ahluwalia, B. Morrow, J. Hsia, and L. Grummer-strawn, Who is breast-feeding? Recent trends from the pregnancy risk assessment and monitoring system, The Journal of Pediatrics, vol.142, issue.5, pp.486-91, 2003.
DOI : 10.1067/mpd.2003.199

L. Dubois and M. Girard, Social inequalities in infant feeding during the first year of life. The 464 Longitudinal Study of Child Development in Quebec Public Health 465, Nutr, vol.6, issue.8, pp.773-83, 1998.

L. Griffiths, A. Tate, and C. Dezateux, The contribution of parental and community ethnicity to 467 breastfeeding practices: evidence from the Millennium Cohort Study, Int J Epidemiol, vol.46834, issue.6, pp.1378-86, 2005.

M. Bonet, M. Kaminski, and B. Blondel, Differential trends in breastfeeding according to maternal 470 and hospital characteristics: results from the French National Perinatal Surveys. Acta 471 Paediatr, p.472, 2007.

R. Li, C. Ogden, C. Ballew, C. Gillespie, and L. Grummer-strawn, Prevalence of Exclusive Breastfeeding Among US Infants: The Third National Health and Nutrition Examination Survey (Phase II, 1991???1994), American Journal of Public Health, vol.92, issue.7, pp.1107-1117, 2002.
DOI : 10.2105/AJPH.92.7.1107

R. Li, J. Hsia, F. Fridinger, A. Hussain, S. Benton-davis et al., Public beliefs about breastfeeding policies in various settings, Raudenbush SW, Bryk AS. Hierarchical linear models : Applications and Data Analysis 478 Methods. CA, pp.1162-1170, 2002.
DOI : 10.1016/j.jada.2004.04.028

J. Loi, relative à la politique de santé publique, Journal Officiel, vol.480, pp.185-14277, 2004.

S. Venancio and C. Monteiro, Individual and contextual determinants of exclusive breast-feeding 486 in Sao Paulo, Brazil: a multilevel analysis 487 28. WHO. Indicators for assessing infant and young child feeding practices. Part 1, Definitions. 488 Conclusions of a consensus meeting held 6-8, Public Health Nutr, vol.9, issue.1, pp.40-46, 2006.

A. Cattaneo, A. Yngve, B. Koletzko, and L. Guzman, Protection, promotion and support of breast-feeding in Europe: current situation, Public Health Nutrition, vol.8, issue.1, pp.39-46, 2005.
DOI : 10.1079/PHN2005660

R. Forste and J. Hoffmann, Breastfeeding Targets for Initiation, Duration, and Exclusivity? The 2003 and 2004 National Immunization Surveys, Journal of Human Lactation, vol.118, issue.115, pp.278-88, 2008.
DOI : 10.1177/0890334408317617

E. Mcintyre, J. Hiller, D. Turnbull, A. Humphreys, N. Thompson et al., Community attitudes to infant feeding Intention to breastfeed in low-income pregnant 498 women: the role of social support and previous experience, Breastfeed Rev 496 Birth, vol.925, issue.323, pp.27-33169, 1998.

S. Hawkins, K. Lamb, T. Cole, and C. Law, Influence of moving to the UK on maternal health behaviours: prospective cohort study, BMJ, vol.336, issue.7652, pp.1052-1057, 2008.
DOI : 10.1136/bmj.39532.688877.25

Y. Hofvander, Breastfeeding and the Baby Friendly Hospitals Initiative (BFHI): organization, 502 response and outcome in Sweden and other countries Breaking the rules' in baby-feeding practice in the UK: deviance and 504 good practice?, 503 35. Furber CM, Thomson AM, pp.1012-1018, 2005.

C. Patton, M. Beaman, N. Csar, and C. Lewinski, Nurses' Attitudes and Behaviors that Promote Breastfeeding, Journal of Human Lactation, vol.12, issue.2, pp.111-116, 1996.
DOI : 10.1177/089033449601200213

J. Grassley and V. Eschiti, Grandmother Breastfeeding Support: What Do Mothers Need and Want?, Birth, vol.21, issue.1, pp.329-364, 2008.
DOI : 10.1111/j.1523-536X.2008.00260.x

. Ile-de-france, Grand Couronne (1094); Languedoc Roussillon (478); Limousin (150); Lorraine (425); Midi-Pyrénées (539), 1145.

. Pays-de-la-loire, Picardie (354); Poitou-Charentes (284); Provence-Alpes-Côte d'Azur (965)

P. Pays-de-la-loire, Auvergne Nord-Pas-de-Calais Haute Normandie Limousin Corse Poitou-Charentes Centre Basse Normandie Midi-Pyrénées Lorraine Champagne-Ardenne Bourgogne Languedoc-Roussillon Aquitaine Bretagne Franche-Comté Grande couronne Alsace Provence-Alpes-Côte d'Azur Paris Petite Couronne Rhône-Alpes Region Intercept and 95% confidence interval *adjusted for individual-level variables