Some lactation consultants might say you can even keep it at room temperature.If you are considering breastfeeding & having enough on hand for others to bottlefeed, an electric breast pump is an EXCELLENT investment!Good luck, have patience, relax! I fed for 1.5 years (6 months exclusively, then less frequency as more solid food was taken in) I had a very positive experience and my son weaned himself (hand to god!)