How To Built Stone Stairs Whats The Best/safest Way To Carry My Newborn Up & Down The Stairs In Our Apartment Building?

Whats the best/safest way to carry my newborn up & down the stairs in our apartment building? - how to built stone stairs

My husband and I live on the second floor in our apartment, and I'm just starting to have our 2 weeks away from home and with us for shopping, food, etc. I know this might sound silly, but I 'm so paranoid of us down a fire and the stone steps and fall with the child and if something happens, I do not know what to do. As part of our main stairs to the sidewalk ... I am delighted to take up or down the stairs in case of an accident nervous. Even if they were still hanging on the rail I am very concerned .... In the case of in her car seat or a scarf if you are up or down the stairs? What is the safest way to do this?