Help! - child() firebase in Ionic

Hey there! I need help;
Im trying to get the child of a list taken from firebase, but Im new in Ionic, and I can’t find a way to use it.

this.list = afDB.list(‘articulos’).valueChanges();

how do I get the child of this list if I don’t know the name of the key or the name of the child?
In Android Studio, I usually use: .child();

this.list = afDB.list('articulos/Fecha).valueChanges();

Can anyone help me? thanks for all.

The Firebase docs have suggestions on how to do so. They also have code samples that do exactly what you’re asking about. I’d check them out