Babies with Menkes disease may be born prematurely (early). At birth, they usually seem healthy. The first symptoms start to appear at about 2 to 3 months of age and may include: Kinky hair (crinkly hair) that’s light-colored, white or gray and breaks easily. Floppy muscle tone (hypotonia). Low body temperature (hypothermia). Saggy facial features. Seizures (epilepsy). Slow growth and weight gain (failure to thrive). Yellowish skin and eyes (jaundice). Symptoms vary from person to person. Symptoms may appear later in childhood or early adulthood, though only in rare cases.