I can't remember what the advert is for but I think it's one of those cutesy 'through the ages' of a couples life, including the birth of their child. It's a new-ish one.
The image of her giving birth shows her face contorted in agony, screaming, clenching her husband's fist and generally looking like a sweaty, petrified mess.
My DDs, aged 8 and 6 have decided, from watching that advert they never want to give birth. My 6yo has gone from wanting 6 children to just wanting a dog when she's older. 
Now, I know they are likely to change their mind at some point as most of us do get over the horror of finding out how you give birth.
But why do these adverts/films have to show it as such a scary experience putting the fear in girls from the start?