Could downs syndrome be a part of asd?

Yes: Cingenital heart defects such ASD are seen frequently in downs.

Down's syndrome: Patients with donwn's syndrome are more likely to have some congenital heart defects. ASD is one of them.

Please be specific: When asking questions on the site please avoid using initials or labels that may have several interpretations. ASD could relate to a heart defect or autistic spectrum disorder as an example & the answer would differ significantly.Though ds patients can have the heart defect, autism spectrum label would be considered inappropriate for a ds patient even though some of the symptom features overlap.