I have a little guy who is around 3 lbs and I have to say that compared to the others, we have to be SO CAREFUL around him. He is much more prone to injury from doing just simple, ordinary things whereas the others are not. He can't go up and down the stairs on his own (he could easily go right through the banister

) and it takes constant hovering over him to make sure he is not jumping on and off the furniture.

I wouldn't trade him for the world, but I do wish he was a bit bigger.