yellowing of very first set of leaves.......?? HELP

What could it be? there about a little over two weeks old.

that happened to me too. my plant is a little further along than yours i have two sets of fan leaves now and it was dro bag seed i think yours shud be fine. im not 100 percent sure but i think those r ment to fall off anyway, like nutrient leaves. when mine got dry i just cut them off. its doing fine now

Yeah those are the cotelydon set of leaves. they die off after first set or two of branches no worries normal !