I have been thinking about this for a while, and it seems to me that I expected much more of my older child (dd, now 6) than I did of my younger child (dd is 3.75) at the same age. Dh says the same, and that he sometimes feels he still expects too much of dd for her age, behaviour- and ability-wise.
Has anyone else experienced this? Is it to do with wanting to keep your "baby" a baby that little bit longer? Or is it because when you have your first child, you don't understand being a parent as well as you do (as well as any of us really do!) when 2nd or 3rd children come along, ie your expectations aren't always realistic or age-appropriate? And why oh why do we keep on doing it, even after we are aware that we do it?!