Sam is Crawling

We've been monitoring Sam's progress for a while, expecting that any day now, he'd figure out how to keep his knees up and under him and coordinate his arms and legs to start moving on his own.  Jack crawled at nine months, but we didn't expect Sam would match that date since he was eight weeks premature.  We were wrong.  When I arrived home today, I put Sam down on the bed while I changed.  He immediately took a four point stance and started scooting toward me.  Previously, he could achieve only the four point stance, rock back and forth, and then push himself back up into a seated position.  For a while, he was pushing himself backwards, but driving in reverse wasn't his goal, I imagine.  

While we celebrate this momentous occasion (pun intended), it's time to break out the electrical plug covers, and start moving all items below waist level to higher ground.