Critical pulmonary stenosis can be a potential lethal condition in neonates. It is defined as a solemn obstruction in pulmonary artery with right to left shunt at interatrial level. To establish the adequate pulmonary blood flow is necessary for survival. Management strateggies may vary. Patients clinical status and the development stage of right ventricle are the most important criterias of choosing the treatment modality. Percutaneus baloon valvuloplasty is one of these management strategies and it is widely performed all over the world. We report a case of newborn with critical pumonary stenosis within seven days after birth..We performed a different mechanical perforation and baloon valvuloplasty tecnique. We used 7 F High Flow Cordistm (DUCOR®) cathether to perforate pulmonary valve. Afterwards baloon valvuloplasty was succesfully done, the gradient has decreased to 40 mm Hg from 100 mm Hg at the pulmonary valve level. Improvement of clinical and laboratory paramaters established within 24 hour after the treatment. The patient was discharged on the third day. Patient follow up still goes in our department. Our modified mechanichal technique can be a good alternative for other approaches.