In the green bar at the top of the page, click on the three horizontal lines to the left, then click on plant problems, then on wilting leaves. I'm horrible at diagnosing and while the converse is possible, it looks like the medium is too dry. Here's a watering tip. When the bag feels light, thoroughly moisten entire pot to a SLIGHT runoff. Make a note of how much water was required and get a feel for that weight. Next time the bag feels light, probably 3-4 days at that age, add water using slightly less. Better moist than wet. Roots gotta breathe. If possible elevate pots, and provide air circulation. Your plants look fine and droopy doesn't have a communicable disease. Sorry to be long winded and good luck.