It looks like there is no air movement inside the pot. The soil looks very dry and I bet the humidity is very low too.
What is the temperature in the pot?
What type of light is that at the top?
What is the Ph of the soil?

See the edges of the leaves?
This is a seedling are you feeding it any nutrients?
Are there nutrients in the soil maybe?

The plant looks like it is transpiring to me and there is not enough moisture to keep it alive. It's dying from the inside out unless you get a few of what I mentioned under control.

You don't feed seedlings nutrients.


YOU DON'T USE ANYTHING WITH THE WORD MIRACLE GROW IN IT!!!!!!!