Soil looks a little soggy, make sure you are letting the soil to dry on top completely before you water them again. If you are letting it dry it could be nute burn. They are to young for nutes, if you are adding them I would stop until they get better. I always wait until the second set of multi fingered leaves before I start nutes, like 3-6 weeks old depending on the plants health.
welcome to the neighborhood, hope this helps you.... good luck