Hi, i have noticed that the new leaves on my Pilea Peperomioides are slightly lighter than the rest. My initial thought is not enough light. It is currently in a south facing window. Thanks!

I've never seen that plant before. It's a Chinese money plant. I peaked on the Internet for the common name. I could use a money plant , to buy more plants.
The leaves are showing water stress, either over or under watering.

I'm not sure whether I'm over or under watering. It's only the new leaves, old leaves are perfectly fine. Perhaps I will let it dry out even more next time before watering, I always let it get pretty dry though

I don't see a problem. New leaves are often a lighter color when they emerge but gradually become darker green.

Protect it from more than an hour or so of direct sun falling on the plant. Allow the top half-inch of soil to dry before watering thoroughly. Use distilled or filtered water if your tap water is hard.

I was a container plant over waterer. Then found out the finger trick. Put your finger in the soil, if it's damp don't water. If it comes out dry then water. 😀 then there's no guessing.

Mindi