THIRD BORNS

A couple months ago we were in public (gasp!) and ran into another family with many youngins. Long story short, she took one look at P's smile and said, "oh, you know you're a third born don't you." Then pointed to her third born and said he gave her a 'run for her money'. A phrase I keep finding associated with third borns. P is six months old. He is already crawling. Already standing. Already cruising. What am I in for with this little guy? I'm thinking now is a good time to finally read up on birth order traits.