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  1. 6 things to expect with Down syndrome babies | Pediatrics ...

  2. Down Syndrome | Birth Defects | CDC - Centers for Disease ...

  3. Down syndrome - Symptoms and causes - Mayo Clinic

  4. Down Syndrome - Boston Children's Hospital

  5. Down syndrome - Diagnosis and treatment - Mayo Clinic

  6. Trisomy 21 (Down Syndrome) - Children's Hospital of Philadelphia

  7. Down Syndrome: Symptoms & Causes - Cleveland Clinic