It's usually caused by problems with a gene located on chromosome 15 called the ubiquitin protein ligase E3A ( UBE3A) gene. If your child seems to have developmental delays or if your child has other signs or symptoms of Angelman syndrome, make an appointment with your child's doctor.Īngelman syndrome is a genetic disorder. The first signs of Angelman syndrome are usually developmental delays, such as lack of crawling or babbling, between 6 and 12 months. Most babies with Angelman syndrome don't show signs or symptoms at birth. Unusual behaviors, such as hand flapping and arms uplifted while walking.Hair, skin and eyes that are light in color.Small head size, with flatness in the back of the head.Seizures, usually beginning between 2 and 3 years of age.People who have Angelman syndrome may also show the following features: Trouble going to sleep and staying asleep.Difficulty walking, moving or balancing well.Developmental delays, including no crawling or babbling at 6 to 12 months.Angelman syndrome signs and symptoms include:
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