Developmental Disabilities

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Developmental disabilities are a group of conditions due to an impairment in physical, learning, language, or behavior areas.
These conditions begin during the developmental period, may impact day-to-day functioning, and usually last throughout a person’s lifetime.
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Developmental Milestones
Skills such as taking a first step, smiling for the first time, and waving “bye-bye” are called developmental milestones.
Children reach milestones in how they play, learn, speak, behave, and move (for example, crawling and walking).
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Children develop at their own pace, so it’s impossible to tell exactly when a child will learn a given skill.
However, the developmental milestones give a general idea of the changes to expect as a child gets older.
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As a parent, you know your child best. If your child is not meeting the milestones for his or her age, or if you think there could be a problem with the way your child plays, learns, speaks, acts, and moves talk to your child’s doctor and share your concerns.
Don’t wait. Acting early can make a real difference!
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Developmental Monitoring and Screening

A child’s growth and development are followed through a partnership between parents and health care professionals. At each well-child visit, the doctor looks for developmental delays or problems and talks with the parents about any concerns the parents might have. This is called developmental monitoring.

Any problems noticed during developmental monitoring should be followed up with developmental screening. Developmental screening is a short test to tell if a child is learning basic skills when he or she should, or if there are delays.

If a child has a developmental delay, it is important to get help as soon as possible. Early identification and intervention can have a significant impact on a child’s ability to learn new skills, as well as reduce the need for costly interventions over time.
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Causes and Risk Factors

Developmental disabilities begin anytime during the developmental period and usually last throughout a person’s lifetime. Most developmental disabilities begin before a baby is born, but some can happen after birth because of injury, infection, or other factors.

Most developmental disabilities are thought to be caused by a complex mix of factors.
These factors include genetics; parental health and behaviors (such as smoking and drinking) during pregnancy;
complications during birth; infections the mother might have during pregnancy or the baby might have very early in life;
and exposure of the mother or child to high levels of environmental toxins, such as lead. For some developmental disabilities, such as fetal alcohol syndrome, which is caused by drinking alcohol during pregnancy, we know the cause. But for most, we don’t.
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Following are some examples of what we know about specific developmental disabilities:

At least 25% of hearing loss among babies is due to maternal infections during pregnancy, such as cytomegalovirus (CMV) infection; complications after birth; and head trauma.
Some of the most common known causes of intellectual disability include fetal alcohol syndrome; genetic and chromosomal conditions, such as Down syndrome and fragile X syndrome; and certain infections during pregnancy.
Children who have a sibling with autism are at a higher risk of also having autism spectrum disorder.
Low birthweight, premature birth, multiple birth, and infections during pregnancy are associated with an increased risk for many developmental disabilities.
Untreated newborn jaundice (high levels of bilirubin in the blood during the first few days after birth) can cause a type of brain damage known as kernicterus. Children with kernicterus are more likely to have cerebral palsy, hearing and vision problems, and problems with their teeth. Early detection and treatment of newborn jaundice can prevent kernicterus.
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The Study to Explore Early Development (SEED) is a multiyear study funded by CDC. It is currently the largest study in the United States to help identify factors that may put children at risk for autism spectrum disorders and other developmental disabilities.

Learn more about SEED »
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Who Is Affected
Developmental disabilities occur among all racial, ethnic, and socioeconomic groups. Recent estimates in the United States show that about one in six, or about 17%, of children aged 3 through 17 years have one or more developmental disabilities, such as:

autism spectrum disorder,
cerebral palsy,
hearing loss,
intellectual disability pdf icon
learning disability,

vision impairment pdf icon

and other developmental delays.

For over a decade, CDC’s Autism and Developmental Disabilities Monitoring (ADDM) Network has been tracking the number and characteristics of children with autism spectrum disorder, cerebral palsy, and intellectual disability in several diverse communities throughout the United States.
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