Teacup pigs are like a breed of dogs, All dog breeds are not the same. Some are bigger than others. Some are bred for different reasons. Just like a with a dog you can starve a Doberman and have it turn into a Miniature pincher. You also can't starve a normal size pig or a pot belly and have it turn into teacup pig. They are all different breeds of pigs.
Teacup pigs are can be a little difficult to raise. Just like a puppy they are going to take work at first. Just like any other pet you are going to have to provide for them. You will want to play with them and cuddle with them. Feed them and water them. In fact teacup pigs have their own food made specifically for them. You can get this food at Mazuri.com