When a new sibling enters the home, jealousy in the older sibling can occur. To minimize this from occurring, try to include the older sibling in many of the activities you do with the newborn.
Additionally, you should also maintain that 1 on 1 time with your older child; take him or her to the park, on a walk, etc. Without the newborn sibling. This can be your "special time" with your older one.