you should never give a seedling nutes. the plant really doesn't need em for at least 2 weeks and even longer if you have nutes already in your soil. did the bag of soil have an N-P-K number on it? and make sure you keep an eye on PH level. try to keep it aroung 6.5-6.8 in soil.
no not at all. just ease up on the nutes if the soil already has nutes in it. wait another 2 weeks before you feed it nutes again and when you start with them start at 1/2 strength once a week. then slowly work them up to a full dose once a week. for now all they need is water and light. good luck and keep us posted.