yellow?

Why are they going yellow?
Because it's a small pot, the watering schedule is to stick a finger in soil every few days. If dry to one knuckle, water tomorrow.  

East facing window with direct sunlight for about 4 hours in the morning.  

It did spend a week next to the window while I was photographing stuff, so it might have had more temperature fluctuations than normal.  

get better baby plant.