It's a time thing, I think.
We can't control time. It doesn't listen to us. It just keeps going. It won't slow down when we want it to. It won't speed up when we want it to. It just... goes. It isn't in our control. We don't think about it too much, most of us, but when we do, it's sometimes hard.
You're older. Your boy won't be a baby again. Actually, that's a good thing. There would be something wrong if he stayed a baby. But, with a little more of that (gasp!) "T" word, he'll soon be a man. And part of you may wonder, "How did this happen? Have I lost something?"
And yet, maybe you haven't. Laura Ingalls Wilder, in her marvelous LITTLE HOUSE books, talks about many Christmases - none of them lavish, but all of them memorable to her. When she and her sisters are teenagers, they have a Christmas that is great in its own way, and one of the girls says, "Why does every Christmas seem better than the last?" Another sister answers, "Maybe it's because we're growing up." Some people would imagine that a past Christmas, the Christmas of a little child, should be the best, but there are some good things about time going on.
If you have a penchant for journaling, you might start writing down all the good things than happen each and every day. Every day is important, even if it's a day filled with tears, as some days are.
There's an poem that reads, in part, "'Yesterday' is but a dream, and 'tomorrow' is only a vision. But today, well lived, makes every yesterday a dream of happiness, and every tomorrow a vision of hope." End of lecture.