Why the Only Begotten Son? (John 1:1-18; LD 13)

The Apostles’ creed uses the language, “Only begotten Son” when it refers to Christ.  This is language that could be confusing because it almost sounds as if Christ was created at some point.  In other words tic could sound as if there was a moment when Christ was here and then another moment prior when Christ was not because the Father produced an heir.  Why would the creed use such language?  Why do we want to use such language?  How does this language communicate that Christ is from eternity rather than Christ having some sort of a beginning?  How does this distinguish Christ’s Sonship from our sonship?