Yellowing a bit too soon

Yep, she hungry. Find some good food for it with a nice NPK ratio. Since it's in veg, you'll want something with a nice amount of nitrogen(N), some phosphorus(P), and a nice amount of potassium(K). Something that's 4-4-4 works pretty good. Or, nitrogen heavy, like 6-2-4. You could even get 4-4-4 and add extra nitrogen. There are companies that make CalMag+, which is 2-0-0 mixture of calcium and magnesium. Mixing that and 4-4-4 together will do vegging plants some good. If you're new here, please select the answer that helped you out the most by clicking on the "answer" button underneath what the person said. If you have any questions, feel free to message me on here. You can pull up your messages tab by clicking on the little airplane in a bubble. It's located on the bottom-right of your screen. I hope this helps!