aloha
my ds is 3.3 he can
pull trousers down to go to toilet and get on toilet himself has been doing this for some time
undress from waist down socks undies trousers loose t shirts pj's etc
he can catch and kick a ball and also hit a soft ball with a bat
ride a scooter yes
use a fork and spoon not tried a knife yet!
make a sandcastle nearly fill the bucket but struggles turning upside down
can go up a downstairs one step at a time facing the right way and does try not to use the bannister.
he can climb into own carseat
cant quite manage the coat yet puts on back to front
brushes his teeth but i have to re do them but i think thats something they only do properly at around 14 when they start noticing girls!! (i am a dental health educator and believe me thats true)
cannot put own shoes on but can put wellies on although sometimes on wrong feet.
all children develop at different rates only last year i was very concerend about ds speach but it seemed all of a sudden he could argue with me.
it does seem though that he shouls maybe be able to do some of these things have you tried asking for a second opinion?