new to group question about signing

[Guest guest]

my son is 3 1/2 yrs old is apraxic. we have taught him Sign Exact

English he knows about 150 or so because he is hearing but not talking.

A month ago he started preschool, I have made them a book of the signs

he knows she knows ASL but is willing to learn SEE. I am wondering if I

should teach him ASL. There are so many videos, books etc out there

about ASL and he will be using sign for along time and I have heard

that SEE and ASL is about 20% similar so if trys to talk to someone

that uses the other sign language there are different means. Does

anyone have any info or suggestions for me. thank you.

G.