My eldest DS began training at 18 months showing a lot of the same signs as your DS.
Just as others recommended, we had a lot of naked time. I actually put our potty in the living room and we spent several days with him sitting on the potty (bare-bottomed) watching TV and reading. Any time he went successfully, we made a HUGE deal out of it.
Few things that worked well for us:
-We had a lot more success with using a child's potty (on the floor) than the seat adaptors for the adult toilet in the beginning.
-Our DS learned to do #1 and #2 sitting on the potty. Once he was approx. 2.5, we taught him to go #1 standing up (which is FABULOUS for public restrooms!!).
-Make sure that you come up with a communication for going to the bathroom (verbal or sign language). He needs to be able to independently tell you when it is time and you need to be able to ask him (and have him give the appropriate response).
-Given the young age of DS, I told him we wouldn't use undies until he had gone successfully in the potty 10 times. We kept track using a star chart and he was very excited to go to the store to pick out his "big boy underpants"- Fortunately he was so proud of his undies, he didn't soil them much. (this only worked �cuz DS understood the value of the star chart and could count to 10)
Like most gifties, my DS got really engrossed in certain activities and would ignore his nagging bladder if there was something more exciting to do. I "trained" quickly to pay attention to his signs and prompt him to go if it had been a while or if he began showing signs of needing to go i.e. holding his crotch. Despite this, DC should be responsible for going without you needing to remind them EVERY 20 minutes. (Then they aren�t trained, you are.
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Ultimately, we were very careful not to push the training and not to scold accidents. DS was very self motivated and within a week had switched from diapers to undies at home. We used pull-up or diapers while away from home (it was winter and we had to contend with snowsuits) for several months. DS never minded this. Also, we used diapers/pull-ups at naptime and night until he was 3-ish just as a precaution because I�m too lazy to deal with soiled sheets.
P.S. I have another DS who is 18mo right now and is no where near ready for toilet training so each kid is very different.
