i think it certainly is possible. Â we're potty training our 22 month old DD and her comprehension is much more than she is able to communicate to us. Â i decided to begin our training based on the following:
1. she does communicate some things she wants, (though never  anything about poop & pee)
2. she doesnt mind sitting on the potty
3. i know her cues (she squats when she wants to poop and with pee she gets this focus in her eyesÂ
 and stands quite still)
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we've put the potty out where she plays and where we hang out, to make it accessible. Â she's naked waist down when we're at home & wears dipes only at sleep times. Â i make her sit on it immediately after she's had something to drink or eat and every 45 min - 1 hr. Â we began a sort of informal 3 day potty training and today (day 3) she went and sat on the potty all by herself - several times! - Â when she needed to go. Â
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i really thought her lack of communication would hold this process up, but im amazed with her progress. Â im hoping her communication will catch up soon, we keep telling her to tell us when she wants to go.
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good luck!