Efficacy of Massage Applied by the Parents in Hospitalized Premature Birth (PreMas)

Inclusion Criteria: * Gestational age between 26 to 37 gestational weeks. * Low birth weight, less than 2249 grams. * Weight of at least 1250 grams at time of entry into study. * Must be at least 48 hours of age. * Must have hemodynamic stability. * Absence of congenital and genetic anomalies. * Absence of alterations of the central nervous system. * Intact skin. * Stable parameters (according to the neonatologist´s criteria) to participate in the intervention. Exclusion Criteria: * Family refusal to participate in the study. * High frequency mechanical ventilation. * Fraction of Inspired Oxygen (FiO2)\>70%. * Inotropic support. * Septic shock. * Persistent tachycardia. * Persistent bradycardia. * Gastrointestinal disorders.