Sep 18, 2013 Early Personality Last night I was scrolling through my wife's smartphone photos, and I came across a video of my son laughing when he was about 6 months old. While listening to my son laugh all I can think of was that he still laughs the same way. For some strange reason I thought his giggling might change over time, but it has not. So, is it safe to say that his personality already developed to what it will be in the future. It's hard to imagine that this can happen at such an early age?