Sibling rivalry often starts right after the birth of a second child. Sometimes the older child becomes aggressive, or even regressive. This means they start acting like a baby again. It is important to prepare your child so they know what to expect. This makes their adjustment to the changes a baby brings easier. . Zebra Tales- Mommy's Baby - the 5th book in The Mr. Stripes series addresses many concerns a older sibling has with a new addition to the family. The book identifies that babies come from Love - then through a mom and dad. This gives a much deeper context to understand life from.