Is it organic miracle gro? If not, then you made the same mistake as me. I will quote someone way smarter then me on this subject:

Quote Originally Posted by stinkyattic
That's your problem right there.

-Pre fertilized soils are WAY too 'hot' for tiny plants. You gotta wait until the first transplant at ~2-3 weeks before you should even consider using them, and even then, you'll want to just go with plain potting soil- those time-release ferts can wreak havoc with your fertilizing routine later!
That quote came from this thread.