Question on Using a Foreach Loop on Nested Children

Hello everyone, I was trying to setup a simple foreach loop that iterates though each child Transform of a GameObject but I ran into a problem:

The loop only finds the immediate child / children of the gameObject that runs it. So, if you have immediate children like: A -> B,C,D would find 3 children), however with nested children like: A -> B -> C -> D will only yield 1 child.

Here is the loop in question (and I belive I've seen this a few times before which lead me to thinking it would work in the first place:

         foreach (Transform trans in gameObject.transform)
         {
             Debug.Log ("found a child transform");
         }

Is this the expected behavior / Am I doing something wrong? (My guess is yes to both questions...). I know I can just make a transform array and use that, but doing it this way just seemed cleaner. Any clarification is appreciated.