When I had my child, I felt like doing nothing but protecting her. 
Having a child changed my life. I never imagined I could be so protective of something. 
user
I have heard the same thing from my friends who have kids!  They say it's like a force takes over as soon as the baby is born
assistant
Yes you want to sheild them from everything bad and nurture them. 
user
That has to be a very powerful feeling.
assistant