This graph shows population projections for the United States of America. The estimated population of the USA in 2050 is 398 million residents.
Down Syndrome â Speech Therapy for Children with Down syndrome have strengths and challenges in development of communication skills, including receptive (understanding) language and expressive (speaking and composing sentences) language skills and reading.
Down's Syndrome. Down's syndrome (also known as Down syndrome) is a genetic chromosome problem. Someone with Down's syndrome has an extra copy of chromosome 21 in the cells of their body. This causes the typical features of the condition. All people with Down's syndrome have some degree of learning disability.