I just commented about buying ahead in sizes for my baby daughter. This reminded me of a question:

I think I have a pretty good grasp on the wierdness of baby sizes ... but ... I have no idea how the "T" sizes translate into height/weight. Does 3T supposedly fit an average 3 year old?

All kids are different, obviously, but what's the average age of a kid who wears these toddler sizes? (I'm thinking girl, since that's what I have.)