yeah, dry out for sure! 13 days old is long enough to set root, unfortunately the root is only 2-3" long. Not nearly enough to justify the plant actually enlarging. Once a seedling gets stunted it can take a week or two before the normal foliage growth starts. But rest assured that if you dry out, that root system is gonna blow up and search out moisture. Some root enhancement would be appropriate at this time. Once the roots are large enough, you will see her grow upwards. GL