1. Introduction
Together with human milk or infant formulas, infants from 4 to 6 months of age onwards receive complementary feeding (beikost) to satisfy their nutritional demands ( Agostoni et al., 2008). In recent years there has been an increase in the consumption of beikost-related products produced at industrial scale. Specifically, in Spain during 2010, the sale of infant foods totaled about 29.5 million kilograms. Of this total, the products most demanded by consumers have been of a fruit-based nature, accounting for 41.8% of the total infant food sales. These kinds of products are usually acquired in hypermarkets and supermarkets, representing more than 85% of the total sales (Mercasa, 2011).