Pulmonary valve stenosis symptoms depend on how much blood flow is blocked. Some people with mild pulmonary stenosis do not have symptoms. Those with more-severe pulmonary stenosis may first notice symptoms while exercising. Pulmonary valve stenosis symptoms may include: 
A whooshing sound called a heart murmur that can be heard with a stethoscope.
Fatigue.
Shortness of breath, especially during activity.
Chest pain.
Fainting.
 Babies with pulmonary valve stenosis may have blue or gray skin due to low oxygen levels.