my son is almost 4 years and still cant say alot of words and a lot of people cant understadn him sometimes when we play the color game i worry a lot if i say isaiah wheres the black card he cant find it but if i point to the black card and say what color is this hell say coffee and i say no its the color black he will not say anthing but coffee its like this with all colors BLACK -coffee BLUE -waterfall RED- blood ORANGE -juice ok same with numbers and letters ill sa say isaiah what letter is this and instead of saying w,t,m,n,k,f,h,z,hell say castial if i say no isaiah it a w hell correct me over and over saying no mommy its a castial shapes are the same thing he will say circle but a square is always a house and a retangle is alwasy a house and a triangle is always an antania he hits his little sister who is 22 months and says while hes hitting her BUT I LOVE HER MOMMY I LOVE HER. he hits everyone me his dad and other sisters i dont know what to do he throwes things that are heavy at the baby and i can remember about 7 diffrent times we took the baby to the hospital when she was about 6 months old from him picking up really heavy objects and throwing them and hitting her in the head and she would have an indention in her head please whats wrong with my son o and he will not even go to the potty anywhere but a diaper tub or floor please help