How does it not hurt the baby when the doctor breaks your water?
When a physician or midwife breaks your water, they use
something called an amniohook (which almost looks like a plastic
knitting needle) to snag the amniotic sac surrounding the baby.
Once this sac is opened, the amniotic fluid leaks out. Because the
sac isn't part of the baby's body, the act of breaking your water
shouldn't hurt the baby.
With that being said, there are some relatively rare risks that
can happen when a physician or midwife breaks your water, so it's
always best to ask about the pros and cons of the procedure before
it happens.