2 year old son starting ABA,Shunted Hydro(obstructed water on brain)

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Hi, I'm , mom to ie. ie is nonverbal, just started

walking on his own at 25 mths... Receives Ot Pt Speech. I started

doing my own therapy with him, sitting him in a strapped chair to do

fine motor skill tasks hand over hand. In a month he is responding to

being able to do the shape sorter, donut ring stacker, and stack

fitted blocks and wooden ones. He is not happy about doing anything

with his hands. Loves cause and effect toys, musical push button

types.... Any comments, advice?? Thank you! Curto