Early stage, fertilizer is no good. Be patient and let the root grow.
With small root, plant can not take in fertilzer.
If you want for plant to look better, spray plant with calcium and magnesium. But this risk killing the plant by over feeding.
For me, I make my own cal/mag solution. I use about 1 grams of calcium nitrate (CaNO3) and 1 gram of Epsom salt (MgSO4) in 1 liter of water. Then spray the plant once a week. Calcium is an "immobile" fertilizer. And it gets in the plant by spray.
Also be careful not to have soil too wet. Root will rot in wet soil. Good luck
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