'Little Child' in the Bible

I am writing to you, fathers, because you know Him who has existed from the beginning. I am writing to you, young men, because you have conquered the evil one. I write to you, little children, because you know the Father.

Little children, it is the last hour, just as you have heard that Antichrist is Coming, and already many Antichrists have appeared; so we may be sure that it is the last hour.