In collaboration with a child-care professional who was responsible for a child suffering from achondroplasia Chereinafter "s child") , we studied the excretion activity of S child, which has been reported in the present paper.In June 2006, we evaluated Child S ’ s way of excretion. Moreover, he inteπiewed his parents and child-care provider about excretion activity of Child S. Child S was able to excrete while holding the edge of lavatory pan. However, it was unhygienic as his genitals were touching the lavatory pan. Therefore, we placed a floor grate Caround 2 cm high) in front of lavatory pan when he would excrete in the lavatory pan. By standing on the floor grate, his genitals did not touch the lavatory pan.since Child S can not endure urination, although child- care provider takes his pant off in most of the cases, after urination we watched and assisted Child S so that he can put on his pant by taking some time. Due to increase in his height, from April 2009 onwards, he could balance his body and urinate without the floor grate, and he could press the flush button as well .He must be supported so that he does not lose the motivation of doing small trivial tasks on his own. Moreover, it is also necessary to upgrade the environment by installing items that can be removed as children grow.