'Child' in the Bible

Because of this I have sent Timothy to you, who is my beloved and faithful child in the Lord, who will remind you of my ways which are in Christ, even as I teach everywhere in every assembly.

When I was a child, I spoke as a child, I felt as a child, I thought as a child. Now that I have become a man, I have put away childish things.

and last of all, as to the child born at the wrong time, he appeared to me also.