You can buy a liquid house breaking aid to put on your pads. Humans cannot smell it but the dog can. It has a hormone in it that attracts the puppy or dog to where it is applied. You have to keep him close to his potty because he is too young to be able to hold back his urine yet.
Amazon.com: Gold Medal Housebreaking Aid for... This will help but he will still need to be near the potty.