4Centers for Disease Control and Prevention(CDC). Progressin increasing breastfeeding and reducing racial ethnic differences UnitedStates,2000-2008 births [J].Mmwr Morb Mortal W klv Rep,2013,62:77-80.
5Otsuka K,Dennis C L,Tatsuoka H,et al.The relationship between breastfeeding serf-efficacy and perceived insufficient milk among Japanese mothers[J].Jognn,2008,37(5):546-555.
6Santorelli G,Petherick E,Waiblinger D,et al.Ethnic differen- cesin the initiation and duration of breast feeding-results from the bomin bradford birth cohort study [J].Paediatr Perinat Epidemiol,2013,27(4): 388-392.
8Nommsen Rivers L A,Chantry C J,Peerson J I,et al.Delay- edonset of lactogenesis among first-time mothers is related tomaternal obesity and factors associated with ineffective breastfeeding[J].Am J Clin Nutr,2010,92(3):574-584.
9Mannion C A, Hobbs A J, McDonald S W, et al. Maternal perceptions of partner supportduringbreasffeeding[J].Intemati- onal Breasffeeding Journal,2013,8(1):4-10.