Key references: Clinical characteristics of Down syndrome
- Bull MJ. Down syndrome. N Engl J Med 2020;382(24):2344–52. https://www.ncbi.nlm.nih.gov/pubmed/32521135
- US Department of Health and Human Services, National Institutes of Health (NIH). What are common symptoms of Down syndrome? Rockville, MD: NIH; Last Reviewed 31/1/2017. https://www.nichd.nih.gov/health/topics/down/conditioninfo/symptoms