Date Night Sitter with Infant Experience

I am looking for a weekend evening babysitter who has infant experience.  We are mainly looking for Saturday nights from about 730-11. We have 3 kids, the two older ones will be sleeping but I am looking for someone who will be willing to take care of a newborn that may be awake during that time.  She is a very easy baby but may need a bottle/diaper change. 

Potentially looking to have this person work part time during the day during the week as well.