BACKGROUND Maternal obesity alters the composition of the breast milk beyond the influence of diet on it: lower concentrations of polyamines, an altered pattern of saturated and trans- fatty acids, and reduced mono- and polyunsaturated fatty acids. In addition, altered bioactive components are also observed such as regulatory factors and growth hormones, regulatory metabolic adiponectin, immunologic factors, cytokines, among others. There is a relationship between indicators of infant growth and body composition; as in the case of leptin that concentrates more on women with obesity. There has been found that those breastfed infants of obese women have a greater weight gain than breastfed infants of normal weight women.