When you have kids the same gender you end up putting them in a lot of the same outfits. It's hard to help but compare how big one is to another.
Vance around 5 months old.
Tanner around 9 months old.
Porter around 5 months old (it was taken today so he's four days away from five months).
Tanner is indeed our runt. :) He chunked out to 21 pounds when he was four months old, but then stayed right around there until after he was a year old. Vance kept getting fatter until he was 8 to 9 months. Time will tell what Porter does, but obviously he has been taking more after Vance so far. :) My poor aching back...no, really....