Is it normal for my seedling to be 2 weeks old and only have there second set of real leafs. A couple are working on there 3rd set but most just there second.

I've just got them in jiffy pots with jiffy seed starting mix.

Do I need to change something or are they progressing normally?

I've jus been giving them strait water that has sat for at least 24 hours to make sure the chlorine and flouride evaporated.

When should I start adding nutrients?