If you’re a clued-in dad, you use the Ergo as much as your wife. It’s supposedly much better for the kiddos back vs Baby Bjorns.
I also hate with a passion the KELTY carriers circa 2006. The kid is WAY WAY WAY WAY too far from your back. Like a giant lever! If you want a frame, these are 2 good ones:
– evenflo trooper http://www.google.com/search?q=evenflo.trooper (this one is amazing. small light. perfect for tight spaces like grocery store when tiny and you don’t care for the ergo.)