Is my seedling healthy?

It's been doing fine since it was planted on 4/10/14. Today I put it in the sunlight and noticed some yellowing around the tip of one of the first leaf sets. Is this a big concern? And also, why are the two bottom leaves curling and not straight like the newer growth?

that leaf lunchs lie sumthings been snacking on it

looks super healthy

Stellar! It's doing wonderful, stop stressing.