Congratulations!! I have no experience with one younger than about 16 weeks, however, regardless of how young Toto had been when we brought her home, she would have been introduced to her wee wee pads!
I believe that a lot that we read is "rule of thumb" and should be taken with a "grain of salt" if there is no danger to our babies!
How old will the little ones be when you bring them home? Good luck!!