Your young son re-potted it?
Reminds of when I tried to re-pot a dying plant at my sister's place some years ago. I'd removed the plant from the pot and discovered that whoever had originally planted it had stuck an empty, crushed 1 liter plastic soda bottle in the bottom. They'd put some potting mix around and over the bottle and placed the plant on top. Of course, this left air pockets around the folds of the bottle and, of course, there was very little soil for the plant - just enough to hide the bottle and make it all look copacetic. Until the plant started dying and I came along.
I was stunned. Who in their right mind would do such a thing? Trying to save on potting soil or what? I never did find out.
Remove your ailing plant from its pot and see what's going on down inside. Maybe you can still save it.