You know what, i think that they pretty much figure it out on their own. I am from England and in England not so many folk crate train. But we bought the crate for Day-z and tried, but it did not work, she did whatever she wanted in the crate and she would end up covered in it. When she was a baby she had her own room downstairs and so i started leaving her in their and not in the crate. She would sleep one end and go pee the other. I got her when she was 10 weeks old and she was driven down from Alabama to Miami and the dog psychologist thought that she had become a "dirty" puppy as when she was travelling down she pretty much had to go in the crate.
Anyway, I would hear her moving in her room and would take her out and after about 4 months she was pretty much able to sleep through the night.
If i did it again though, I would have the puppy in my room with me at night - we did not do this as she could not climb the stairs (and i did not want her to for her hips) and she was soon too heavy to carry.
However, I did buy a steam cleaner to sterilise her room and we got through gallons of natures miracle to get rid of the smell reminding her where to go.
I think what i am saying is - they figure it out for themselves and baby bladders need emptying often.
Everytime she walked anywhere when she was a baby i was so worried that she was about to go potty - but eventually it worked and she is all dry now (apart from very minor accidents).
Even though it does not feel like it at the time, it really does get better. But, sometimes i wonder what it would be like to stay in bed past 7.
Jill