Aletha and Frank Are Worried About Their 1-Year-Old Baby

Multiple Choice

Aletha and Frank are worried about their 1-year-old baby. His eyes are almond-shaped unlike theirs) , his head seems small, and his development is slower than average - he's just now starting to sit up by himself. Which of the following disorders would you suspect their baby has?

A) Huntington's disease
B) Klinefelter's syndrome
C) Turner's syndrome
D) Down syndrome