Jamie is exactly six months' old today, or "a half" in baby terms.
When he gets a bit older and begins to understand these things a little better, he'll no doubt start to break the year down into quarters. We've all been there.
But then all the quarters begin to add up, we turn 30 or more and we wonder where the time went.
Being a half must surely carry with it increased responsibilities although I can't, for the life of me, think what they are.
Perhaps I'll delay the "father and son coming of age chat" for a little while longer.
Maybe for another 14 years or so.
And a half.