- Will be excluded from the study infants that parents did not agree on participation; diagnosed with major congenital anomalies; with necessity of chest drainage; diagnosis of intracranial hemorrhage grades III and IV according to the criteria of Papile et al; persistence ductus arteriosus with hemodynamic consequences and diagnosis of severe perinatal asphyxia - defined as less than 6 APGAR with 5 minutes of life.