Should I change my daughters name?

Right now I have 5 kids, Michael, Elizabeth, Kailey, Zachary, Sadie. Sadie is almost 2 months old and I want to change her name. Sadie now sounds to childish. I would love to change her name and I already have the name picked out for if I do change it. So do you think I should change Sadie Kristine to Lauren Kristine?