Be prepared for a variety of reactions from your older child when a newborn joins your family. It is normal for an older child to feel jealous and displaced when you have another baby. The older sibling may go back to thumb-sucking, abandon potty training, or display other similar behaviors. These acts are unconscious efforts to take attention away from the newborn and focus it back on themselves.
Plan for and respond to sibling rivalry before your baby is born by:
Once your baby is born, try some of the following suggestions:
In time and given the right encouragement, your older child will learn how to deal with his or her feelings toward a new baby sister or brother, to share, to feel responsible for other family members, and to get along with others.
WebMD Medical Reference from Healthwise