I've been trying to potty train my son for 1 week. He's naked & we've only had one success. He's an easy going child & will sit on the potty ever 20 mins for a few mins, but nevertheless always has an accident right after getting up. Even plying him with water he doesn't urinate much, it's either at nap or bed, which is how he always is. I'm not sure how to make him successful, he's really trying but no luck. Any thoughts?