Stretchy skin can mean one of several things and all them warrant evaluation by a physician. Hyperelasticity syndrome is not a disease by itself but rather is a description of a spectrum of diseases including Ehleros-Danlos syndrome and Marfan's syndrome. Skin can become hyperelasatic for a variety of reasons. If a child is dehydrated, the skin can seem stretchier. Two genetic syndromes Marfan's and Ehleros-Danlos syndromes result in hyperextendible skin and very mobile joints. Specific to Marfan's syndrome syndrome is a tall stature, and a prominent bottom to the sternum. It is thought that Abraham Lincoln may have had Marfan's syndrome. Both Ehleros-Danlos and Marfans both carry risks of rupture of major arteries. Thus, they must be taken seriously and watched carefully by a qualified physician. I suggest that you schedule an appointment with your son's pediatrician
and point out the stretchy skin because it is a part of the physical exam that is prone to being missed. Have the pediatrician check your son's joints and perform a detailed cardiac exam. If there are multiple positive finds, he may warrant some genetic testing to look for one of the hyperelasticity syndromes.