Feeding question

We have fawns about 2 weeks old we are bottle feeding Advance Milk Replacer for Kid goats. The fawns vary in sizes. I am wondering how much they should be eating by now. Times per day and amount per feeding. Is there a rule of thumb to follow. The directions on the bag are not very specfic. They are outside - they have dirt, grain and green available.

When can I expect them to poop on their own.

Thanks

Marsha