What are the features of Noonan syndrome?
This is a variable syndrome. This means that a person who has this syndrome may not show all the symptoms. They may not even know they have it until they have a child who happens to have more of the features of Noonan syndrome. It is possible to have very few problems with this syndrome. A baby born with Noonan syndrome may have a short neck, with excess skin where the neck joins the shoulders. This can make the neck seem broad and is sometimes called “webbing.” Frequently there are differences in the eyes, including strabismus (cross-eyedness), nystagmus (eye tremors) and very bright blue-green iris. The chest may be shaped a little differently, either sticking out (pectus carinatum) or sinking (pectus excavatum). There is an increased risk of some degree of hearing loss. More serious problems include a smaller than normal jaw. This can create some feeding problems, and even in some cases lead to failure to thrive. Babies with this syndrome are also at an increased risk of cardiac def
