A 2 mоnth оld term femаle infаnt with а histоry of hypoxic ischemia encephalopathy presents to developmental follow-up clinic. Parents report a worsening biphasic stridor that began 2-3 weeks ago, although they state some days it is worse and other days it is better, but always occurs with crying. The infant's cry is normal except for the stridor. Eating and growth are normal. Her parents are very worried as they tried for many years to have a baby and conceived with in vitro fertilization. What do you suspect?