Does anyone know if childbirth is painful for the baby?

We don't think so. I can't imagine it is comfortable but there doesn't seem to be pain exactly. There have been some studies looking at brain wave pattern and heart rate patterns during labor and most babies don't look much different during labor and delivery than they did the week before. So, in a normal birth, it doesn't appear that they feel pain. It must feel weird to have your head squeezed though.