How do you acces a child obj in an object from a C# script?

Questions & Answers
1

I have an object in unity, and that object has a child object. i want to acces that child object's y scale from a script attatched to the parent object. how is this done?

2 
transform.Find("ChildName").localScale.y

although I wouldn't recommend doing the search every frame - just find it once, store and reuse it.