Changing diapers is different.
That is so interesting that you said that about facial expressions. My daughter always waitf for my facial expression and has made me very aware of how important that is in our communication ! I never noticed this with my son. My son seemed much more verbal which is not the norm I know. My daughter is very verbal but doesn't seem to have as many words as he has that she uses regularly but has a lot and understands more than she uses. She is also more of a risk taker and much more aggressive and resistant to limit setting. My son being first born is much more of a parent pleaser, My duaghter couldn't give a blank what we care about or how we react. My daughter which is not the norm is much more physical, climbing etc, son was never a climber. I think birth order has something to do with it as well. The one think I can say is that it is great, after having a boy to be able to do hair and bond with her with beauty treatments and girly things and dolls and "my little pony's" my poor son had to deal with all of this before she came along !There are a LOT of differences! In my experience, girls pick up much more easily on facial expressions. Girls tend to be much more verbal than boys (i.e talk non-stop). Additionally, my daughter understood how to annoy her brothers VERY early on. Even when she was barely verbal, if she said something and one of her brothers got upset by it, she would smile and do it again... and again. She understood the finer points of relationships much more quickly than her brothers. She has also been much more bossy than her brothers; if no one else will take charge of a situation, she will step right up! She is more affected by how others feel. Me saying I am disappointed about something has a much bigger impact on her than on her brothers, who tend to need something more concrete.
Now, part of this might have to do with the fact that she is also a third child, and not simply because she is a girl, but before I had both boys and girls I tended to discount the idea that boys and girls are inherently different. But in my experience they definitely are.