I don't think I'll give birth to a mermaid nor a dolphin... so a
'normal' delivery would do fine, thanks! 
It's amazing though... for the first 8-9 months of our lives, we
live immersed in a water inside mom.
And then, the minute a baby is born, you know why there's this
famous comic scene where the doctor holds the baby upside-down and
smacks him/her on the butt? 
That's cause in the old days, they probably did that. Now, the
midwives would give baby a good suction to make sure Jr can breathe
well without secretions obstructing his passageway. 
You know why when babies first come out, they HAVE to cry
loud-loud??
That's because up till then, they've been living in a water-filled
environment, so the alveolus in the lungs are all deflated. That
first cry is baby's very first breath that send air rushing into
the airways, channeled by the carina into the bronchus and then,
pop! pop! pop!... all the alveoli's pop open, and baby breathes
room air like mom and dad!
No first cry, the doc and midwives have to do something to make
baby take that first deep breath, otherwise, the alveolus doesn't
inflate and open, and baby goes into oxygen deprivation.
