If there were still any doubts that Olive Cohen is getting a sibling, they were put to rest yesterday. Mama Isla Fisher and the tot were spotted carrying some new books, including Joanna Cole's popular, I'm a Big Sister ($7) while out in LA. Though the newly married actress has yet to confirm her pregnancy, she seems to be getting the future big sister ready for a brother or sister.

The addition of subsequent babies to a family can be quite a shock for tots who are used to being the center of their parents' attention. Before the anticipated lil one arrives, check out these tips for preparing your existing offspring for their new siblings: