Yes, our little guy turned 4 weeks yesterday.  He celebrated by crying uncontrollably and generally giving his parents a bad time 🙂

Here are some facts from a newsletter we get about what life is like at 4 weeks old:

Your baby can probably focus on and track moving objects now. Try giving his new skills a workout by slowly passing a toy in front of his face or by having a little “staring contest” during which you walk slowly back and forth in front of him. Watch how his eyes lock with yours and follow along with your movement. This skill is a building block for hand-eye coordination, which will come later.