Shaken Baby

So I work in the Neonatal Intensive Care Unit and it used to be like birth control for me years ago, but now that I've grown up I want to start a family. However, the other day I was at work and this baby just would stop crying. Like the whole twelve hour shift, it seemed like a constant loud, screeching cry. OH MY LIFE!!! It got to the point where I seriously wanted to shake the shit outta that baby. I felt so wrong for having those feelings. I feel like because I felt that way, I might not really be ready for motherhood. What do you think?