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  1. What are the signs of intellectual and development disabilities …

  2. About Intellectual and Developmental Disabilities (IDDs)

  3. Intellectual and Developmental Disabilities (IDDs) - NICHD

  4. Down Syndrome - NICHD - Eunice Kennedy Shriver National …

  5. What are the symptoms of Down syndrome? - NICHD

  6. Fragile X Syndrome - NICHD - Eunice Kennedy Shriver National …

  7. Fragile X Syndrome | NICHD - NICHD - Eunice Kennedy Shriver …

  8. What are some signs of learning disabilities? - NICHD

  9. Phenylketonuria (PKU) - NICHD - Eunice Kennedy Shriver National ...

  10. Down Syndrome | NICHD - NICHD - Eunice Kennedy Shriver …