Quoting I'mOnFire:" My parents tried to put hot sauce and things like that on my thumb so when i would suck it it would scare ... [snip!] ... get him to stop? I know getting someone to stop sucking on something that's attacked has to be a lot harder than a pacifier."
Yes, anything that's soft or fluffy he has to have to go to sleep. If he even sees anything that looks soft though he sticks his thumb in his mouth and lays down. He's extremely texture sensitive and his doctor has said to not to discourage it by taking anything away because he's so borderline autistic. I haven't asked him yet how to go about breaking him of it because I hadn't really thought about it until yesterday. I'll bring it up at his 2 year check up.