Uh, I just printed off that article Alelou gave a link for. Skimmed it, will read it properly on the bus going home from work. Looks quite interesting!
Four and a half years ago when Skyelar was born, the whole family was in the labor/delivery room. Brother and sister (ages 11 and 14) actually watched her being born. Image (14) had picked up the video camera to record the birth, but the nurse said that was against the hospital rules. ???? So Image picked up a still camera and took pictures. As soon as Skyelar was with the nurse being cleand off on the table next to her mother's birthing bed, older sister and brother were crowding around the nurse. Image was holding the baby before Mom even got to see her. Mom got to hold her and then Skyelar was passed around to about ten different people of all ages. Skyelar's eyes were open and she seemed to be looking at everyone, her face quietly curious as if she would like to be saying "Hi there. Who are you? But don't expect me to remeber your name." She didn't cry, just looked.
When my own daughter was born in 1974, a bunch of people offered to take her. As if I would give her up! That might be cultural, a Native American thing, to offer to take a newborn as your own if you thought the mother had too much to handle already.
When Shayla was born two years ago, she was cesarian because my daughter had become diabetic. So no family in the delivery room. But when she was brought to the room where she would be with my daughter, older brother and sister bent close to inspect her! Yes, humans certainly "share" babies!

Working on a major fan fic project. Two-thirds done. Hope to put it up in the not TOO distant future.