Great Question I was wondering the same thing since I have to go into work a couple times in the upcoming months. I want to breastfeed as much as possible, but when I have to go into work I want to be able to leave some bottles with my babysitter so she can feed Kara if she gets hungry. Man I am going to have to try to learn how to express breastmilk. I may just send formula since expressing is difficult for me, and way too time consuming when you have a preschooler running around.