Human chromosomes arranged in a karyotype. Notice they are in pairs and each pair is numbered. The last pair ( sex chromosomes) are labeled X and Y. That means it is a boy. Notice the Y is much smaller than the X.
http://chasinghazel.com/2014/10/hand-strenthening-ot-down-syndrome.html 2 Occupational Therapy Activities that promote muscle development in the hands. I do them with my daughter who has Down syndrome.