Complications of Noonan syndrome

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Noonan syndrome can have the associated medical problems:

After birth, growth in height and weight is usually at a slightly slower rate than normal.
Feeding difficulties with babies, including poor suckling and weaning. Frequent or forceful vomiting may also occur.
Common eye problems including short sightedness and a squint. This can normally be corrected with glasses.
Hearing problems caused by middle ear infections.
Tendency to bruise easily.
Undescended testicles in 60% of boys with Noonan Syndrome. This can be treated surgically at an early age.
Delayed puberty in both boys and girls.
Swelling of the hands and feet, and the back of the neck during pregnancy, due to excess fluid.
Poor muscle tone in early development, which may cause clumsiness.
Skin and hair abnormalities. Short and sparse or thick and curly hair may be found, along with dry patches of skin and skin blemishes.
Mild developmental delay. Around 10% of children with Noonan Syndrome require special education, but the disorder is not normally associated with severe learning difficulties.