<prompt> Apnea of prematurity is defined as sudden stoppage of breathing that lasts for10 sec15 sec20 sec30 sec  <response>: Apnea of prematurity defined as sudden stoppage of breathing that lasts for 20 sec or is associated with bradycardia or cyanosisApnea of prematurity should be different from periodic breathing which is normal phenomenon is preterm neonate.Refer: Nelsons Textbook of Pediatrics, SAE, 1st edition, pg no. 832, 849 - 850 