Jesus did not become the Son of God when He was born in Bethlehem. He has always been the Son of God from eternity past, still is the Son of God, and always will be.
Hindi si Hesus naging Anak ng Diyos ng isilang Siya sa Bethlehem. Siya ay Diyos na mula pa sa walang hanggan at Siya ay mananatiling Diyos at Anak ng Diyos magpakailanman.