OBJECTIVE: To describe the therapeutic failure of the nostril wide as the clinic. CASE REPORT: newborn females by vaginal delivery (vaginal) with prenatal controls in order. By examining the permeability of the nasal cavities is clear that the K35 probe not farther than 1.5 cm, which feels the physical obstruction which is why it leaves the halo with 02 and comes into our referral service. Physical examination: general appearance: normosomic newborn female, well nourished, active, reactive, calls attention to the nasal congestion, buccal breathing. Nose: normal configuration, clear rhinorrhea bilateral, bilateral nasal tank close to the vision right. Flexible endoscopy is performed where notes that lack of width does not allow passing the pediatric fiberoptic endoscopy. Once we confirm the patency of both nasal tank albeit at a lower flow is initiated breast feeding within 24 hours of life, after evaluation by otolaryngology, good suction, which does not hamper his breathing. CONCLUSION: The initial assessment should be focused on distinguishing between the perform aperture stenosis and choanae atresia, and this is achieved by means of tomography and endoscopic study. Need to investigate the associated anomalies. The appropriate diagnosis and management of the airway is essential to avoid complications, either surgical or conservative manner, both with good results. The treatment according to the clinic.