“…Factors that have been reported could be classified as biological (e.g., breast pain, soreness, or milk production; Almqvist-Tangen et al, 2012), demographic (e.g., socioeconomic status, educational levels, marital status, or age; Barona-Vilar et al, 2009;Kools et al, 2005Kools et al, , 2006Scott et al, 1999;Taveras et al, 2003), psychological (e.g., personality traits, motivation, self-confidence, or maternal identity; Cooke et al, 2007;Eksioglu & Ceber, 2011;Wagner et al, 2006), and social (e.g., attitudes, or social norms; Kools et al, 2005). What is more, in the last century, BF rates have changed across time with several societal events such as the promotion and increasing availability of formula milk, migrations from rural to industrialized areas, increasing access of women to education, changes in family structure, the incorporation of mothers into the labor market, progressive increase of partners' involvement in the care of the baby, regulation of maternity leave, and an increasing number of health-promoting programs or the 'return to the nature' movement (Colodro-Conde et al, 2011;Dennis, 2002;Vahlquist, 1981).…”