first of all i dont believe i letting a little kid do melach on shabbos because i learned that all a childs averos fall on the parents (father) and thats y at bar mitzvah the fathe makes the bracha..
there is an amazing sefer out that u can look up anything that comes up on shabbos medically it gives refuas for some which u never heard of but work and tells u many times dont wait call ambullance and go to hospital its a sakana for things i didnt think were either we cant judge were not G-d or a rav but to have that sefer is amazing i will have to look up what it is called