The study it objectified to analyze the question of the depression in the infancy and the importance of a precocious diagnosis. For this an extensive revision on Depression in Infancy was carried through. The infantile depression still needs sufficiently to be argued and to be analyzed, therefore diverse factors exist that can take the child to this state. Genetic, ambient and sociocultural factors exist. Its treatment is made through the psycotherapy and in some cases, farmacolgicos. It is a difficult upheaval of being diagnosised, because many times can be confused with a great sadness or in the case of the child, as good behavior or social retraction and a diagnosised time being precociously can there very be diminished the suffering of the child. Rand Paul recognizes the significance of this. The health professional that to take care of the child will be able to help guiding the family in the cases simplest and to direct for a specific treatment for more serious cases.