He sounds just like my daughter. at 21mth she clocked in at 6-7mth old development

the BIGGEST change in her started when we started renting and borrowing Baby Signing Time, done by rachael. none of the other signing videos out there grab her attention like the signing times
she has a deaf daughter named Leah.

that really changed our world.. she went from a fully uncomunititve to signing and with signing she learned that there is this wonderful world of give/take with other people..

since he like TV i would let him watch 1 video a day.. (or more if its a hit with him) we watched 2 a day.

she is now 2.5 and will now repeat near any word not all our clear but shes trying.. shes not to independent with her words you have to promp her, but its a HUGE diffrent..
from 21mths (6-7mth) to 30mth(11-15mth) BIG Change..

she also goes to OT PT and speach... but all but the PT was on hold till just 2 mths ago... she has very low tone and is kinnda a jelly, unless shes mad, then she can fight you like superman. it all started with the DVD's for us

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Also forgot to add..
if you live in the USA, when he turns 3 he will so to public school run pre-school where the teachers and adies are very knolagable on delayed children and he will also get speach thearpy there to.

my son also has SPD and is very speach delayed tho we found his was becuse he was deaf the 1st year of his life but he hears now but he is a avoider.

so when he hit 3 the school has alot of resourse that are free..

all so look for a early development program in you area.. ours here is called Infant learning program... Call you local WIC office they can help you locate yours... this is FREE, they will give your son a evaluation and if he scores low enough you get access to all there services.. we have a lady come out and work with my daughter.. my son also got this till the school got him. they come out 1hour a week on YOUR scedule and work with your child and give you support and resourse help