Paddy's new puppies are just about 4 weeks old and have been peeing on their own will for about a week now. We've started noticing their patterns, sleep, pee, eat, pee, squirm, pee. So every time we see an indicator, we take them to a puppy pee pad and presto - puppy squats and pees! Then we do the puppy pee-pee dance! Ok, so they don't know or get it but we're proud nonetheless!!!
The predictability of poop is not as exact - that is this week's task.
Keep a pee pad near them, and I think you might find that they will soon be attracted to it. Good luck with your little ones!