Aidan is out-pacing Ellie in the growth department. He may have started out smaller than her at birth, but he's growing more rapidly. At his 2-month check up on November 5th, he weighed just over 13 lbs while Ellie was only 11 lbs 10 oz at the same age. He's also very proportional, being in the 75th percentile for boy babies in the categories of weight, height & head size.
As you can see from the picture, he's a happy and thriving baby. Aidan is "talking" a lot these days, probably trying to figure out how to share in all of that attention his sister is getting!