After a diet comprised solely of milk, weaning i.e. the period of dietary diversification corresponding to the gradual introduction of new foods, represents a phase of physiological, psychological and sensory adaptation for infants in learning how to eat all types of food, a balanced and varied diet, that of an adult-type diet, which he soon will share.
Among the most frequent symptoms encountered in infants during the first year of life, crying certainly is the most common one, but is also the most difficult to understand because it is non-specific. The following two clinical cases illustrate the complexity of the problem posed.
Iron deficiency is considered to be the most common nutritional deficiency known, affecting about 500-600 million people worldwide 1. It seems paradoxical that even in industrialized countries, where the problem would seem to be that of overeating and hence of overweight, in practice, in recent years there has been a marked increase in malnutrition in terms of so-called partial deficiencies. These include deficiencies of mineral salts (iron, zinc, selenium), vitamins (folic acid) and essential fatty acids. Since they are associated with inadequate dietary intake, their incidence can be underestimated as they may not be clinically evident at the outset.