When choosing a pot size for your young transplant, it can be tempting to take a small plant and put it into a very large pot in order to encourage it to grow. However, because the potting medium surrounding a young transplant may hold more water than would be utilized by the plant, this quick fix could result in root rot.
Instead, repot your transplants into containers only one or two inches larger than their original pot size, allow enough time for the expanding roots to fill in, then you can bump your healthy plants up again.