So, ya, Zach goes both ways

Zach can roll over from front to back (like he's been doing since he was 3 weeks old) as well as from back to front. I just now saw him roll from back to front for the first time. We knew he could do it, though, because he fell asleep on his back in his crib and was on his tummy when we went in this morning. I said, "Hey, he can roll over." Jean-Paul replied, "Ya, he's been doing it for a while." Here I've been thinking he hadn't done it yet! Why do men not think as much of these "milestones", or at least not think to share?!