Looks like a defficiency. But how?

A deficiency this early I usually cause by a ph problem in the soil of watering too much. Don't be discouraged. I had a few plants this summer that were looking pretty bad first weeks and eventually grew out of it in a few weeks. Try a little kelp and cal mag, and noticed my baby plants respond to coconut water very well. maybe some of those enzymes can help with some of the lock up in the soil and buffer the ph too.