How to access children transforms

I’m sure this is super simple, but I can’t seem to figure it out. How do I access the transform of a game object that is a child of another transform?

I’ve tried using

MyParentTransform.gameObject.GetComponentInChildren(Transform);

but that just returns MyParentTransform.

Any ideas?

Ok, I get it now. I have to use the plural form of that command, GetComponentsInChildren(), in order to get an array of all children, and then take the second one in that array as the immediate child.