At around 6-8 months of age, kids develop object permanence, or the ability to understand that things exist when they are not actively being sensed.

This does not mean that younger babies don't recognize familiar things, as they very much do. The boy has smiled at the sight of me and his mom for several months. The difference is that now, he has the ability to understand that we do exist when we're gone, and he can miss us. One would think that this would bring me great joy, to know that when I'm not around, my boy misses me.

Perhaps one day, I'll get to that point of feeling great joy about this. As for right now, let me tell you my observations about his development of object permanence.

The boy doesn't sleep. Seriously. We put him down in his crib, and he misses us so much he cries...for hours. Lots of crying. No sleep.

I'm not kidding, he doesn't sleep.

Nobody warned me about this, and that makes me bitter. Bitter and tired. Future parents, tuck this knowledge away in the back of your minds. Consider yourselves warned.

Important Note: I love my boy. I don't love not sleeping.