Early Exposure to OMT Prevents Long LOS

Inclusion Criteria: * preterm infants born at age between 29 and 37 weeks * osteopathic treatment performed \< 14 days after birth * preterms born in the same hospital Exclusion Criteria: * Gestational age \< 29 weeks * Gestational age \> 37 weeks * First OMT performed after 14 days from birth * genetic disorders * congenital disorders * cardiovascular abnormalities * proven or suspected necrotized enterocolitis with or without gastrointestinal perforation proven or suspected abdominal obstruction * pre/post surgery patients * pneumoperitoneum * atelectasis * Newborn from an HIV seropositive/drug addicted mother * respiratory disorders * transferred to/from other hospital * admitted for preterminal comfort care (defined as neither intubation nor cardio-respiratory resuscitation)