N.R.
Hi K. I have a 4yr old with PDD who I just got potty trained back in the fall. I addressed it with he OT and it's up to the child when they want to train...sadly. I did a potty chart in the bathroom with stickers and his video games were his reinforcers...candy didn't work.
Wk #1
Put child on potty with lid up and pants down with timer....getting the child use to sitting on the pot.
Timer set for 5-8 min 90 minutes apart **got prize for sitting
Wk#2
child on potty seat up and pants up to help with the feeling of the toilet seat being "open"
set timer for same amount of time etc........
Wk#3
undwear time!!! messy but follow the same criteria as above...
Wk#4
NO PRIZE UNLESS THEY POTTY IN THE POTTY-----then get the reinforcer of choice
My son was ready---Had him trained in 3.5 weeks. My BSC was floored how fast I got him trained.
Don't worry...this is normal for spectrum kids to be behind in this.
Best Wishes
N.