While being an uncle I've got to experience how kids behave on a one to one level, so have at least some understanding of how to look after them, I suppose that also comes from a mother who is so much of a baby boomer who melts every time she see's a baby.
For me its more that I see children in the same way I would chimps, watching their behavior and determining when the child ends and the adult begins, what lasts from the childhood stage and what gets left behind, reflecting on my own character as a kid and teen to today.
Going on the younger stage of childhood however, some things I find interesting, having babysat two boys and what that often intales.
1 - The way children if they get hurt, either by accident or purposely as fights often break out between them, when one child is hurt and starts to cry and wail, how when the pain has obviously well long past the point of it hurting anymore, some children will keep milking it, even causing themselves more discomfort from the wailing they force themselves into.
2 - The slow growth of empathy is interesting to watch, often it cane take years for a child to develop a sense of empathy for one another, how when something hurts, its not nice to cause they hurt to others in the same way. Often it seems kids learn Schadenfreude long before they develop empathy, just getting a joy out of pushing someone over or slapping them to get a reaction.
3 - How little inhibitions they have to the things they talk about and do, imagine is a board meeting have adults talking the way children do, talking about bums and peepees and poo, stripping off their clotsh and walking around naked, that drive kids have getting withheld by the development of modesty over time.
I've just had this on my mind today, probably after watching a david attenborough program on chimps the other day, when I think of the connection between primates and humans, I just look at human child behavior and see the same things in them.