management of pain in preterm infants is essential because it is exposed to repetitive movements painful and invasive miners such as surgical treatment of the ductus arteriosus which is accompanied by respiratory instability, increased consumption analgesics. Acupuncture has shown its analgesic efficacy in numerous studies in children and adults. Acupuncture (laser) is a simple, fast method without side effect used in children, but no study exists on the effect of acupuncture in the treatment of perioperative pain in addition to pharmacologic agents in preterm infants. Hypothesis: acupuncture reduce pain and discomfort after surgery of the ductus arteriosus in preterm infants in addition to pharmacologic agents