I'm sorry.

It was the responsibility of the midwife to explain it to you, and the risks and benefits of the procedure, before she went ahead with it. This is known as informed consent, but unfortunately it is often lacking in the medical field.

And it is not a 'teensy scratch into the baby's skin'. The OP and others reading this are grown women and should be provided with accurate information so that they can make choices for themselves and their babies.
Absolutely what Hoti said. I had it performed without my consent and it is disgusting that medical teams believe that you accept their dictations when you step into their room without giving proper information.