Inclusion Criteria:  a birth weight of 1,000 gr and above, a gestational age between 30 and 34 weeks, no congenital anomaly, no severe asphyxia or chronic lung disease, spontaneous breathing, grades III and IV intracranial hemorrhage and no periventricular leukomalacia  exclusion criteria.  congenital anomaly grades III and IV intracranial hemorrhage and periventricular leukomalacia