One way to help an older child (5-10 yrs)bond with the new baby-to-be is to involve him or her in the pregnancy from the very beginning. One thing that can help with that is a book called, "Making Me: The Pregnancy Activity Book for My Big Brother or Sister" by Julie B. Carr. It's not specific towards stepfamilies, but will involve the sibling every day of the pregnancy and give them a great understanding of what's going on. Each day, the baby-to-be 'speaks' to the child. It describes what is happening and gives the big bro/sis a related activity to do - ex. "I am now 3 inches long - go find something in the house that is 3 inches long." Some days the activity might be coloring, or doing a math problem ("I weigh 5 pounds now. How much do you weigh? How much more do you weigh than I weigh?") or journaling ("What are your 3 favorite names for me so far?") or any number of other activities. It can be very helpful in involving the whole family in the creation of a new baby.