Anal Atresia is a known birth defect, and does often involve the urinary system as well to varied extents. Generally, the child will have the sphincter muscles (the hold-it muscles), but the bowel ends in nowhere land (or connects to the urinary system). This is a serious situation and a colostomy is done for the first year (give or take) then a pull thru operation is done to make a semi-normal rectum (asshole). These people have various degrees of control depending on biology and doctor skill, but (and I can say this at 35, from experience) their lives are not over any more than someone with diabetes; It can sure as S--- be troublesome, and it can sure as H--- be invasive on lifestyle, but it can be adapted to by the person dealing with it. I DO recommend support for these people (psychologically, around puberty, and in the pursuit of / identification of appropriate jobs & job skills (not all jobs are manageable, just as not all jobs are manageable by someone on crutches).
I also recommend some dignity be shown from the people of this world. This thread is populated with some of the terrible social ostracism we are faced with, having this condition - it isn't our fault, it is our challenge, and while it's certainly an odd and awkward one, it doesn't deserve childish responses ("omg i'd kill myself!", etc) in a public venue.