Reet-i was a live in nanny/babysitter before i had my 1st so i was pretty strong from the begining but yes the more kids and experience the stronger you get and you dont let a screaming baby upset you and you dont panic at every whimper it does get easier
I have been a live-in and live-out nanny, and I have worked in childcare for ten years, and I can't handle hearing a baby scream. Having done the study behind it too, and learning the psychology (and reading the articles here and here) there is NO WAY I could ever let my baby scream, or even anyone else's. I could never ignore my little girl, knowing that she needs me. She is too little to be manipulating me; what she needs is to be loved, held and made secure. The only thing babies need to learn is that their mummies will be there for them.