After watching the newest episode, I was wondering how Changelings could look in the human world. Also as everybody knows, Changelings are kinda like bugs, but how can they born in the human world if their human counterparts exist?

Hello maby like captain America test subjekts injected whit som strange Liquid

I have a story called Of Nights and Changelings which actually deals with this. It isn't really a headcannon of mine, but it does establish a potential way Equestria Girls changelings could exist as well as what Nightmare Moon was in the human world.

5439910 I kinda imagin the changeling counter part be somthing like this.
minus the horn and normal skin color.

5439957
Yeah, but how they can shapeshift without magic?

5439959 I have a headcanon that magic has always existed before the Sunset Shimmer came to the EG world. It's been secretive to the world then her original world.

I have a headcanon that human changelings are just people that are really good at disguises. They excel at makeup and crossdressing so much so that they can appear to be anyone.